human
the segment had operating earnings of $709 million in 2007, compared to operating earnings of $787 million in 2006. the decrease in operating earnings was primarily due to a decrease in gross margin, driven by: (i) lower net sales of iden infrastructure equipment, and (ii) continued competitive pricing pressure in the market for gsm infrastructure equipment, partially offset by: (i) increased net sales of digital entertainment devices, and (ii) the reversal of reorganization of business accruals recorded in 2006 relating to employee severance which were no longer needed. sg&a expenses increased primarily due to the expenses from recently acquired businesses, partially offset by savings from cost-reduction initiatives. r&d expenditures decreased primarily due to savings from cost- reduction initiatives, partially offset by expenditures by recently acquired businesses and continued investment in digital entertainment devices and wimax. as a percentage of net sales in 2007 as compared to 2006, gross margin, sg&a expenses, r&d expenditures and operating margin all decreased. in 2007, sales to the segment 2019s top five customers represented approximately 43% (43%) of the segment 2019s net sales. the segment 2019s backlog was $2.6 billion at december 31, 2007, compared to $3.2 billion at december 31, 2006. in the home business, demand for the segment 2019s products depends primarily on the level of capital spending by broadband operators for constructing, rebuilding or upgrading their communications systems, and for offering advanced services. during the second quarter of 2007, the segment began shipping digital set-tops that support the federal communications commission (201cfcc 201d) 2014 mandated separable security requirement. fcc regulations mandating the separation of security functionality from set-tops went into effect on july 1, 2007. as a result of these regulations, many cable service providers accelerated their purchases of set-tops in the first half of 2007. additionally, in 2007, our digital video customers significantly increased their purchases of the segment 2019s products and services, primarily due to increased demand for digital entertainment devices, particularly hd/dvr devices. during 2007, the segment completed the acquisitions of: (i) netopia, inc., a broadband equipment provider for dsl customers, which allows for phone, tv and fast internet connections, (ii) tut systems, inc., a leading developer of edge routing and video encoders, (iii) modulus video, inc., a provider of mpeg-4 advanced coding compression systems designed for delivery of high-value video content in ip set-top devices for the digital video, broadcast and satellite marketplaces, (iv) terayon communication systems, inc., a provider of real-time digital video networking applications to cable, satellite and telecommunication service providers worldwide, and (v) leapstone systems, inc., a provider of intelligent multimedia service delivery and content management applications to networks operators. these acquisitions enhance our ability to provide complete end-to-end systems for the delivery of advanced video, voice and data services. in december 2007, motorola completed the sale of ecc to emerson for $346 million in cash. enterprise mobility solutions segment the enterprise mobility solutions segment designs, manufactures, sells, installs and services analog and digital two-way radio, voice and data communications products and systems for private networks, wireless broadband systems and end-to-end enterprise mobility solutions to a wide range of enterprise markets, including government and public safety agencies (which, together with all sales to distributors of two-way communication products, are referred to as the 201cgovernment and public safety market 201d), as well as retail, energy and utilities, transportation, manufacturing, healthcare and other commercial customers (which, collectively, are referred to as the 201ccommercial enterprise market 201d). in 2008, the segment 2019s net sales represented 27% (27%) of the company 2019s consolidated net sales, compared to 21% (21%) in 2007 and 13% (13%) in 2006. (dollars in millions) 2008 2007 2006 2008 20142007 2007 20142006 years ended december 31 percent change.
|  | <i>Years Ended December 31</i> | <i>Percent Change</i> |
| <i>(Dollars in millions)</i> | <i>2008</i> | <i>2007</i> | <i>2006</i> | <i>2008—2007</i> | <i>2007—2006</i> |
| Segment net sales | $8,093 | $7,729 | $5,400 | 5% | 43% |
| Operating earnings | 1,496 | 1,213 | 958 | 23% | 27% |
segment results 20142008 compared to 2007 in 2008, the segment 2019s net sales increased 5% (5%) to $8.1 billion, compared to $7.7 billion in 2007. the 5% (5%) increase in net sales reflects an 8% (8%) increase in net sales to the government and public safety market, partially offset by a 2% (2%) decrease in net sales to the commercial enterprise market. the increase in net sales to the government and public safety market was primarily driven by: (i) increased net sales outside of north america, and (ii) the net sales generated by vertex standard co., ltd., a business the company acquired a controlling interest of in january 2008, partially offset by lower net sales in north america. on a geographic basis, the segment 2019s net sales were higher in emea, asia and latin america and lower in north america. 65management 2019s discussion and analysis of financial condition and results of operations%%transmsg*** transmitting job: c49054 pcn: 068000000 ***%%pcmsg|65 |00024|yes|no|02/24/2009 12:31|0|0|page is valid, no graphics--color: n|.
Please answer the following questions with expressions if necessary.
what was the amount of the reduction in the segment 2019s backlog in 2007?
assistant
2.6
human
what was the amount in 2006?
assistant
3.2
human
what is the net difference?
assistant
subtract(2.6, 3.2)
human
what is the difference divided by the 2006 value?
assistant
subtract(2.6, 3.2), divide(#0, 3.2)