human
december 2016 acquisition of camber and higher volumes in fleet support and oil and gas services, partially offset by lower nuclear and environmental volumes due to the resolution in 2016 of outstanding contract changes on a nuclear and environmental commercial contract. segment operating income 2018 - operating income in the technical solutions segment for the year ended december 31, 2018, was $32 million, compared to operating income of $21 million in 2017. the increase was primarily due to an allowance for accounts receivable in 2017 on a nuclear and environmental commercial contract and higher income from operating investments at our nuclear and environmental joint ventures, partially offset by one time employee bonus payments in 2018 related to the tax act and lower performance in fleet support services. 2017 - operating income in the technical solutions segment for the year ended december 31, 2017, was $21 million, compared to operating income of $8 million in 2016. the increase was primarily due to improved performance in oil and gas services and higher volume in mdis services following the december 2016 acquisition of camber, partially offset by the establishment of an allowance for accounts receivable on a nuclear and environmental commercial contract in 2017 and the resolution in 2016 of outstanding contract changes on a nuclear and environmental commercial contract. backlog total backlog as of december 31, 2018, was approximately $23 billion. total backlog includes both funded backlog (firm orders for which funding is contractually obligated by the customer) and unfunded backlog (firm orders for which funding is not currently contractually obligated by the customer). backlog excludes unexercised contract options and unfunded idiq orders. for contracts having no stated contract values, backlog includes only the amounts committed by the customer. the following table presents funded and unfunded backlog by segment as of december 31, 2018 and 2017:.
|  | December 31, 2018 | December 31, 2017 |
| ($ in millions) | Funded | Unfunded | Total Backlog | Funded | Unfunded | Total Backlog |
| Ingalls | $9,943 | $1,422 | $11,365 | $5,920 | $2,071 | $7,991 |
| Newport News | 6,767 | 4,144 | 10,911 | 6,976 | 5,608 | 12,584 |
| Technical Solutions | 339 | 380 | 719 | 478 | 314 | 792 |
| Total backlog | $17,049 | $5,946 | $22,995 | $13,374 | $7,993 | $21,367 |
we expect approximately 30% (30%) of the $23 billion total backlog as of december 31, 2018, to be converted into sales in 2019. u.s. government orders comprised substantially all of the backlog as of december 31, 2018 and 2017. awards 2018 - the value of new contract awards during the year ended december 31, 2018, was approximately $9.8 billion. significant new awards during the period included contracts for the construction of three arleigh burke class (ddg 51) destroyers, for the detail design and construction of richard m. mccool jr. (lpd 29), for procurement of long-lead-time material for enterprise (cvn 80), and for the construction of nsc 10 (unnamed) and nsc 11 (unnamed). in addition, we received awards in 2019 valued at $15.2 billion for detail design and construction of the gerald r. ford class (cvn 78) aircraft carriers enterprise (cvn 80) and cvn 81 (unnamed). 2017 - the value of new contract awards during the year ended december 31, 2017, was approximately $8.1 billion. significant new awards during this period included the detailed design and construction contract for bougainville (lha 8) and the execution contract for the rcoh of uss george washington (cvn 73). .
Please answer the following questions with expressions if necessary.
what was the net change in value of operating income for technical solutions segment from 2017 and 2018?
assistant
subtract(32, 21)
human
what was the value of operating income for technical solutions segment in 2017?
assistant
21
human
what was the percent change?
assistant
subtract(32, 21), divide(#0, 21)