{"pre_text": ["at december 31 , 2012 and 2011 , we had a working capital surplus .", "this reflects a strong cash position , which provides enhanced liquidity in an uncertain economic environment .", "in addition , we believe we have adequate access to capital markets to meet any foreseeable cash requirements , and we have sufficient financial capacity to satisfy our current liabilities .", "cash flows millions 2012 2011 2010 ."], "post_text": ["operating activities higher net income in 2012 increased cash provided by operating activities compared to 2011 , partially offset by lower tax benefits from bonus depreciation ( as explained below ) and payments for past wages based on national labor negotiations settled earlier this year .", "higher net income and lower cash income tax payments in 2011 increased cash provided by operating activities compared to 2010 .", "the tax relief , unemployment insurance reauthorization , and job creation act of 2010 provided for 100% ( 100 % ) bonus depreciation for qualified investments made during 2011 , and 50% ( 50 % ) bonus depreciation for qualified investments made during 2012 .", "as a result of the act , the company deferred a substantial portion of its 2011 income tax expense .", "this deferral decreased 2011 income tax payments , thereby contributing to the positive operating cash flow .", "in future years , however , additional cash will be used to pay income taxes that were previously deferred .", "in addition , the adoption of a new accounting standard in january of 2010 changed the accounting treatment for our receivables securitization facility from a sale of undivided interests ( recorded as an operating activity ) to a secured borrowing ( recorded as a financing activity ) , which decreased cash provided by operating activities by $ 400 million in 2010 .", "investing activities higher capital investments in 2012 drove the increase in cash used in investing activities compared to 2011 .", "included in capital investments in 2012 was $ 75 million for the early buyout of 165 locomotives under long-term operating and capital leases during the first quarter of 2012 , which we exercised due to favorable economic terms and market conditions .", "higher capital investments partially offset by higher proceeds from asset sales in 2011 drove the increase in cash used in investing activities compared to 2010. ."], "table": [["cash flowsmillions", "2012", "2011", "2010"], ["cash provided by operating activities", "$ 6161", "$ 5873", "$ 4105"], ["cash used in investing activities", "-3633 ( 3633 )", "-3119 ( 3119 )", "-2488 ( 2488 )"], ["cash used in financing activities", "-2682 ( 2682 )", "-2623 ( 2623 )", "-2381 ( 2381 )"], ["net change in cash and cashequivalents", "$ -154 ( 154 )", "$ 131", "$ -764 ( 764 )"]], "table_ori": [["<i>Cash Flows</i><i>Millions</i>", "<i>2012</i>", "<i>2011</i>", "<i>2010</i>"], ["Cash provided by operating activities", "$6,161", "$5,873", "$4,105"], ["Cash used in investing activities", "(3,633)", "(3,119)", "(2,488)"], ["Cash used in financing activities", "(2,682)", "(2,623)", "(2,381)"], ["Net change in cash and cashequivalents", "$(154)", "$131", "$(764)"]]}

Question: what was the change in millions of cash provided by operating activities from 2011 to 2012?
Evidence:
table_1: cash flowsmillions the cash provided by operating activities of 2012 is $ 6161 ; the cash provided by operating activities of 2011 is $ 5873 ; the cash provided by operating activities of 2010 is $ 4105 ;
Program: subtract(6161, 5873)
Answer:
str_answer: 288
exe_answer: 288