table of contents ( 4 ) the decline in cash flows was driven by the timing of inventory purchases at the end of 2014 versus 2013 .in order to manage our working capital and operating cash needs , we monitor our cash conversion cycle , defined as days of sales outstanding in accounts receivable plus days of supply in inventory minus days of purchases outstanding in accounts payable , based on a rolling three-month average .components of our cash conversion cycle are as follows: .
[['( in days )', 'december 31 , 2015', 'december 31 , 2014', 'december 31 , 2013'], ['days of sales outstanding ( dso ) ( 1 )', '48', '42', '44'], ['days of supply in inventory ( dio ) ( 2 )', '13', '13', '14'], ['days of purchases outstanding ( dpo ) ( 3 )', '-40 ( 40 )', '-34 ( 34 )', '-35 ( 35 )'], ['cash conversion cycle', '21', '21', '23']]
( 1 ) represents the rolling three-month average of the balance of trade accounts receivable , net at the end of the period divided by average daily net sales for the same three-month period .also incorporates components of other miscellaneous receivables .( 2 ) represents the rolling three-month average of the balance of merchandise inventory at the end of the period divided by average daily cost of goods sold for the same three-month period .( 3 ) represents the rolling three-month average of the combined balance of accounts payable-trade , excluding cash overdrafts , and accounts payable-inventory financing at the end of the period divided by average daily cost of goods sold for the same three-month period .the cash conversion cycle remained at 21 days at december 31 , 2015 and december 31 , 2014 .the increase in dso was primarily driven by a higher accounts receivable balance at december 31 , 2015 driven by higher public segment sales where customers generally take longer to pay than customers in our corporate segment , slower government payments in certain states due to budget issues and an increase in net sales and related accounts receivable for third-party services such as software assurance and warranties .these services have an unfavorable impact on dso as the receivable is recognized on the balance sheet on a gross basis while the corresponding sales amount in the statement of operations is recorded on a net basis .these services have a favorable impact on dpo as the payable is recognized on the balance sheet without a corresponding cost of sale in the statement of operations because the cost paid to the vendor or third-party service provider is recorded as a reduction to net sales .in addition to the impact of these services on dpo , dpo also increased due to the mix of payables with certain vendors that have longer payment terms .the cash conversion cycle decreased to 21 days at december 31 , 2014 compared to 23 days at december 31 , 2013 , primarily driven by improvement in dso .the decline in dso was primarily driven by improved collections and early payments from certain customers .additionally , the timing of inventory receipts at the end of 2014 had a favorable impact on dio and an unfavorable impact on dpo .investing activities net cash used in investing activities increased $ 189.6 million in 2015 compared to 2014 .the increase was primarily due to the completion of the acquisition of kelway by purchasing the remaining 65% ( 65 % ) of its outstanding common stock on august 1 , 2015 .additionally , capital expenditures increased $ 35.1 million to $ 90.1 million from $ 55.0 million for 2015 and 2014 , respectively , primarily for our new office location and an increase in spending related to improvements to our information technology systems .net cash used in investing activities increased $ 117.7 million in 2014 compared to 2013 .we paid $ 86.8 million in the fourth quarter of 2014 to acquire a 35% ( 35 % ) non-controlling interest in kelway .additionally , capital expenditures increased $ 7.9 million to $ 55.0 million from $ 47.1 million in 2014 and 2013 , respectively , primarily for improvements to our information technology systems during both years .financing activities net cash used in financing activities increased $ 114.5 million in 2015 compared to 2014 .the increase was primarily driven by share repurchases during the year ended december 31 , 2015 which resulted in an increase in cash used for financing activities of $ 241.3 million .for more information on our share repurchase program , see item 5 , 201cmarket for registrant 2019s common equity , related stockholder matters and issuer purchases of equity securities . 201d the increase was partially offset by the changes in accounts payable-inventory financing , which resulted in an increase in cash provided for financing activities of $ 20.4 million , and the net impact of our debt transactions which resulted in cash outflows of $ 7.1 million and $ 145.9 million during the years .

Question: from dec 31 , 2013 to dec 31 , 2014 , what was the percentage decrease in the length of the cash conversion cycle?
Answer: 9.5%