The following graph shows the results of a study evaluating the number of schools teaching different sex-education topics. A graph titled Sex Education in Schools shows years on the horizontal axis and percentages on the vertical axis. The percentage of schools teaching sex education has declined across a range of topics. Teaching about how to correctly use a condom has decreased from 55% in 2000 to 40% in 2014.

In 2006, approximately what percentage of schools taught students how to use a condom?

40 percent
60 percent
75 percent
85 percent