. operating income margins over the past several years have been in excess of 22% ( 22 % ) , helped by solid sales growth and an ongoing strong commitment to maintaining operational discipline throughout 3m 2019s global operations . operating income margins of 25.3% ( 25.3 % ) in 2007 were positively impacted by 2.8 percentage points ( $ 681 million ) from the gain on sale of businesses and real estate , net of environmental liabilities , restructuring and other exit activities