The line graph indicates that in 1960, 23% of U.S. taxes came from corporate income tax. F...

The line graph indicates that in 1960, 23% of U.S. taxes came from corporate income tax. For the period from 1960 through 2010, this percentage decreased by approximately 0.28 each year. If this trend continues, by which year will corporations pay zero taxes? Round to the nearest year.