operating profit for the segment increased 10% ( 10 % ) in 2009 compared to 2008 . the growth in operating profit primarily was due to increases in air mobility and other aeronautics programs . the $ 70 million increase in air mobility 2019s operating profit primarily was due to the higher volume on c-130j deliveries and c-130 support programs . in other aeronautics programs , operating profit increased $ 120 million , which mainly was attributable to improved performance in sustainment activities and higher volume on p-3 programs . additionally , the increase in operating profit included the favorable restructuring of a p-3 modification contract in 2009 . combat aircraft 2019s operating profit decreased $ 22 million during the year primarily due to a reduction in the level of favorable performance adjustments on f-16 programs in 2009 compared to 2008 and lower volume on other combat aircraft programs . these decreases more than offset increased operating profit resulting from higher volume and improved performance on the f-35 program and an increase in the level of favorable performance adjustments on the f-22 program in 2009 compared to 2008 . the remaining change in operating profit is attributable to a decrease in other income , net , between the comparable periods . backlog increased in 2010 compared to 2009 mainly due to orders exceeding sales on the c-130j , f-35 and c-5 programs , which partially were offset by higher sales volume compared to new orders on the f-22 program in 2010 . backlog decreased in 2009 compared to 2008 mainly due to sales exceeding orders on the f-22 and f-35 programs , which partially were offset by orders exceeding sales on the c-130j and c-5 programs . we expect aeronautics will have sales growth in the upper single digit percentage range for 2011 as compared to 2010 . this increase primarily is driven by growth on f-35 low rate initial production ( lrip ) contracts , c-130j and c-5 rerp programs that will more than offset a decline on the f-22 program . operating profit is projected to increase at a mid single digit percentage rate above 2010 levels , resulting in a decline in operating margins between the years . similar to the relationship of operating margins from 2009 to 2010 discussed above , the expected operating margin decrease from 2010 to 2011 reflects the trend of aeronautics performing more development and initial production work on the f-35 program and is performing less work on more mature programs such as the f-22 and f-16 , even though sales are expected to increase in 2011 relative to 2010 . electronic systems our electronic systems business segment manages complex programs and designs , develops , produces , and integrates hardware and software solutions to ensure the mission readiness of armed forces and government agencies worldwide . the segment 2019s three lines of business are mission systems & sensors ( ms2 ) , missiles & fire control ( m&fc ) , and global training & logistics ( gt&l ) . with such a broad portfolio of programs to provide products and services , many of its activities involve a combination of both development and production contracts with varying delivery schedules . some of its more significant programs , including the thaad system , the aegis weapon system , and the littoral combat ship program , demonstrate the diverse products and services electronic systems provides . electronic systems 2019 operating results included the following : ( in millions ) 2010 2009 2008 .
what were average net sales for electronic systems in millions from 2008 to 2010?
net sales for electronic systems increased by 6% ( 6 % ) in 2010 compared to 2009 . sales increased in all three lines of business during the year . the $ 421 million increase at gt&l primarily was due to growth on readiness and stability operations , which partially was offset by lower volume on simulation & training programs . the $ 316 million increase at m&fc primarily was due to higher volume on tactical missile and air defense programs , which partially was offset by a decline in volume on fire control systems . the $ 94 million increase at ms2 mainly was due to higher volume on surface naval warfare , ship & aviation systems , and radar systems programs , which partially was offset by lower volume on undersea warfare programs . net sales for electronic systems increased by 6% ( 6 % ) in 2009 compared to 2008 . sales increases in m&fc and gt&l more than offset a decline in ms2 . the $ 429 million increase in sales at m&fc primarily was due to growth on tactical missile programs and fire control systems . the $ 355 million increase at gt&l primarily was due to growth on simulation and training activities and readiness and stability operations . the increase in simulation and training also included sales from the first quarter 2009 acquisition of universal systems and technology , inc . the $ 55 million decrease at ms2 mainly was due to lower volume on ship & aviation systems and undersea warfare programs , which partially were offset by higher volume on radar systems and surface naval warfare programs. .