human
standardized maintenance based on an industry trade publication, we operate the eighth largest vocational fleet in the united states. as of december 31, 2014, our average fleet age in years, by line of business, was as follows: approximate number of vehicles approximate average age.
|  | Approximate Number of Vehicles | Approximate Average Age |
| --------- | --------- | --------- |
| Residential | 7,600 | 7 |
| Commercial | 4,300 | 7 |
| Industrial | 3,900 | 9 |
| Total | 15,800 | 7.5 |
through standardization of core functions, we believe we can minimize variability in our maintenance processes resulting in higher vehicle quality while extending the service life of our fleet. we believe operating a more reliable, safer and efficient fleet will lower our operating costs. we have implemented standardized maintenance programs for approximately 60% (60%) of our fleet maintenance operations as of december 31, 2014. cash utilization strategy key components of our cash utilization strategy include increasing free cash flow and improving our return on invested capital. our definition of free cash flow, which is not a measure determined in accordance with united states generally accepted accounting principles (u.s. gaap), is cash provided by operating activities less purchases of property and equipment, plus proceeds from sales of property and equipment as presented in our consolidated statements of cash flows. for a discussion and reconciliation of free cash flow, you should read the 201cfree cash flow 201d section of our management 2019s discussion and analysis of financial condition and results of operations contained in item 7 of this form 10-k. we believe free cash flow drives shareholder value and provides useful information regarding the recurring cash provided by our operations. free cash flow also demonstrates our ability to execute our cash utilization strategy, which includes investments in acquisitions and returning a majority of free cash flow to our shareholders through dividends and share repurchases. we are committed to an efficient capital structure and maintaining our investment grade credit ratings. we manage our free cash flow by ensuring that capital expenditures and operating asset levels are appropriate in light of our existing business and growth opportunities, and by closely managing our working capital, which consists primarily of accounts receivable, accounts payable, and accrued landfill and environmental costs. dividends in july 2003, our board of directors initiated a quarterly cash dividend of $0.04 per share. our quarterly dividend has increased from time to time thereafter, the latest increase occurring in july 2014 to $0.28 per share, representing a 7.7% (7.7%) increase over that of the prior year. over the last 5 years, our dividend has increased at a compounded annual growth rate of 8.1% (8.1%). we expect to continue paying quarterly cash dividends and may consider additional dividend increases if we believe they will enhance shareholder value. share repurchases in october 2013, our board of directors added $650 million to the existing share repurchase authorization originally approved in november 2010. from november 2010 to december 31, 2014, we used $1439.5 million to repurchase 46.6 million shares of our common stock at a weighted average cost per share of $30.88. as of december 31, 2014, there were $360.2 million remaining under our share repurchase authorization. during 2015, we expect to use our remaining authorization to repurchase more of our outstanding common stock. .
Please answer the following question with expressions if necessary.
and how much did they represent in relation to the commercial number of vehicles?
assistant
divide(7600, 4300)