general market conditions affecting trust asset performance , future discount rates based on average yields of high quality corporate bonds and our decisions regarding certain elective provisions of the we currently project that we will make total u.s .
and foreign benefit plan contributions in 2014 of approximately $ 57 million .
actual 2014 contributions could be different from our current projections , as influenced by our decision to undertake discretionary funding of our benefit trusts versus other competing investment priorities , future changes in government requirements , trust asset performance , renewals of union contracts , or higher-than-expected health care claims cost experience .
we measure cash flow as net cash provided by operating activities reduced by expenditures for property additions .
we use this non-gaap financial measure of cash flow to focus management and investors on the amount of cash available for debt repayment , dividend distributions , acquisition opportunities , and share repurchases .
our cash flow metric is reconciled to the most comparable gaap measure , as follows: .

(dollars in millions)
2013
2012
2011
Net cash provided by operating activities
$1,807
$1,758
$1,595
Additions to properties
(637)
(533)
(594)
Cash flow
$1,170
$1,225
$1,001
<i>year-over-year change</i>
(4.5)%
22.4%

year-over-year change ( 4.5 ) % (  % ) 22.4% ( 22.4 % ) the decrease in cash flow ( as defined ) in 2013 compared to 2012 was due primarily to higher capital expenditures .
the increase in cash flow in 2012 compared to 2011 was driven by improved performance in working capital resulting from the one-time benefit derived from the pringles acquisition , as well as changes in the level of capital expenditures during the three-year period .
investing activities our net cash used in investing activities for 2013 amounted to $ 641 million , a decrease of $ 2604 million compared with 2012 primarily attributable to the $ 2668 million acquisition of pringles in 2012 .
capital spending in 2013 included investments in our supply chain infrastructure , and to support capacity requirements in certain markets , including pringles .
in addition , we continued the investment in our information technology infrastructure related to the reimplementation and upgrade of our sap platform .
net cash used in investing activities of $ 3245 million in 2012 increased by $ 2658 million compared with 2011 , due to the acquisition of pringles in 2012 .
cash paid for additions to properties as a percentage of net sales has increased to 4.3% ( 4.3 % ) in 2013 , from 3.8% ( 3.8 % ) in 2012 , which was a decrease from 4.5% ( 4.5 % ) in financing activities our net cash used by financing activities was $ 1141 million for 2013 , compared to net cash provided by financing activities of $ 1317 million for 2012 and net cash used in financing activities of $ 957 million for 2011 .
the increase in cash provided from financing activities in 2012 compared to 2013 and 2011 , was primarily due to the issuance of debt related to the acquisition of pringles .
total debt was $ 7.4 billion at year-end 2013 and $ 7.9 billion at year-end 2012 .
in february 2013 , we issued $ 250 million of two-year floating-rate u.s .
dollar notes , and $ 400 million of ten-year 2.75% ( 2.75 % ) u.s .
dollar notes , resulting in aggregate net proceeds after debt discount of $ 645 million .
the proceeds from these notes were used for general corporate purposes , including , together with cash on hand , repayment of the $ 750 million aggregate principal amount of our 4.25% ( 4.25 % ) u.s .
dollar notes due march 2013 .
in may 2012 , we issued $ 350 million of three-year 1.125% ( 1.125 % ) u.s .
dollar notes , $ 400 million of five-year 1.75% ( 1.75 % ) u.s .
dollar notes and $ 700 million of ten-year 3.125% ( 3.125 % ) u.s .
dollar notes , resulting in aggregate net proceeds after debt discount of $ 1.442 billion .
the proceeds of these notes were used for general corporate purposes , including financing a portion of the acquisition of pringles .
in may 2012 , we issued cdn .
$ 300 million of two-year 2.10% ( 2.10 % ) fixed rate canadian dollar notes , using the proceeds from these notes for general corporate purposes , which included repayment of intercompany debt .
this repayment resulted in cash available to be used for a portion of the acquisition of pringles .
in december 2012 , we repaid $ 750 million five-year 5.125% ( 5.125 % ) u.s .
dollar notes at maturity with commercial paper .
in april 2011 , we repaid $ 945 million ten-year 6.60% ( 6.60 % ) u.s .
dollar notes at maturity with commercial paper .
in may 2011 , we issued $ 400 million of seven-year 3.25% ( 3.25 % ) fixed rate u.s .
dollar notes , using the proceeds of $ 397 million for general corporate purposes and repayment of commercial paper .
in november 2011 , we issued $ 500 million of five-year 1.875% ( 1.875 % ) fixed rate u .
s .
dollar notes , using the proceeds of $ 498 million for general corporate purposes and repayment of commercial paper. .

Question: Analyse this data from a financial earnings document. by what percent did cash provided by operations increase between 2011 and 2013?
Choices:
0.11732
0.13292
0.10219
132915.3605
0.03072
Correct choice index: 1