{"pre_text": ["air mobility sales declined by $ 535 million primarily due to c-130j deliveries ( 12 in 2006 compared to 15 in 2005 ) and lower volume on the c-5 program .", "combat aircraft sales increased by $ 292 million mainly due to higher f-35 and f-22 volume , partially offset by reduced volume on f-16 programs .", "other aeronautics programs sales increased by $ 83 million primarily due to higher volume in sustainment services activities .", "operating profit for the segment increased 21% ( 21 % ) in 2007 compared to 2006 .", "operating profit increases in combat aircraft more than offset decreases in other aeronautics programs and air mobility .", "combat aircraft operating profit increased $ 326 million mainly due to improved performance on f-22 and f-16 programs .", "air mobility and other aeronautics programs declined $ 77 million due to lower operating profit in support and sustainment activities .", "operating profit for the segment increased 20% ( 20 % ) in 2006 compared to 2005 .", "operating profit increased in both combat aircraft and air mobility .", "combat aircraft increased $ 114 million , mainly due to higher volume on the f-35 and f-22 programs , and improved performance on f-16 programs .", "the improvement for the year was also attributable in part to the fact that in 2005 , operating profit included a reduction in earnings on the f-35 program .", "air mobility operating profit increased $ 84 million , mainly due to improved performance on c-130j sustainment activities in 2006 .", "backlog decreased in 2007 as compared to 2006 primarily as a result of sales volume on the f-35 program .", "this decrease was offset partially by increased orders on the f-22 and c-130j programs .", "electronic systems electronic systems 2019 operating results included the following : ( in millions ) 2007 2006 2005 ."], "post_text": ["net sales for electronic systems increased by 6% ( 6 % ) in 2007 compared to 2006 .", "sales increased in missiles & fire control ( m&fc ) , maritime systems & sensors ( ms2 ) , and platform , training & energy ( pt&e ) .", "m&fc sales increased $ 258 million mainly due to higher volume in fire control systems and air defense programs , which more than offset declines in tactical missile programs .", "ms2 sales grew $ 254 million due to volume increases in undersea and radar systems activities that were offset partially by decreases in surface systems activities .", "pt&e sales increased $ 113 million , primarily due to higher volume in platform integration activities , which more than offset declines in distribution technology activities .", "net sales for electronic systems increased by 7% ( 7 % ) in 2006 compared to 2005 .", "higher volume in platform integration activities led to increased sales of $ 329 million at pt&e .", "ms2 sales increased $ 267 million primarily due to surface systems activities .", "air defense programs contributed to increased sales of $ 118 million at m&fc .", "operating profit for the segment increased by 12% ( 12 % ) in 2007 compared to 2006 , representing an increase in all three lines of business during the year .", "operating profit increased $ 70 million at pt&e primarily due to higher volume and improved performance on platform integration activities .", "ms2 operating profit increased $ 32 million due to higher volume on undersea and tactical systems activities that more than offset lower volume on surface systems activities .", "at m&fc , operating profit increased $ 32 million due to higher volume in fire control systems and improved performance in tactical missile programs , which partially were offset by performance on certain international air defense programs in 2006 .", "operating profit for the segment increased by 17% ( 17 % ) in 2006 compared to 2005 .", "operating profit increased by $ 74 million at ms2 mainly due to higher volume on surface systems and undersea programs .", "pt&e operating profit increased $ 61 million mainly due to improved performance on distribution technology activities .", "higher volume on air defense programs contributed to a $ 52 million increase in operating profit at m&fc .", "the increase in backlog during 2007 over 2006 resulted primarily from increased orders for certain tactical missile programs and fire control systems at m&fc and platform integration programs at pt&e. ."], "table": [["( in millions )", "2007", "2006", "2005"], ["net sales", "$ 11143", "$ 10519", "$ 9811"], ["operating profit", "1410", "1264", "1078"], ["backlog at year-end", "21200", "19700", "18600"]], "table_ori": [["<i>(In millions)</i>", "<i>2007</i>", "<i>2006</i>", "<i>2005</i>"], ["Net sales", "$11,143", "$10,519", "$9,811"], ["Operating profit", "1,410", "1,264", "1,078"], ["Backlog at year-end", "21,200", "19,700", "18,600"]]}

Question: what was the percentage change in backlog from 2005 to 2006?
Evidence:
table_3: ( in millions ) the backlog at year-end of 2007 is 21200 ; the backlog at year-end of 2006 is 19700 ; the backlog at year-end of 2005 is 18600 ;
Program: subtract(19700, 18600), divide(#0, 18600)
Answer:
str_answer: 6%
exe_answer: 0.05914