The formula $y = 2.5\sqrt{x} + 15$ models the percent of U.S. adults who are considered obese by federal guidelines, where $x$ is the number of years after 1989, and $y$ is the percent of obese adults. In this equation, $y$ is already converted from a decimal, so, for example, a 55% obesity rate would correspond to $y = 55$.
According to this formula, in what year was the obesity rate 19.3 percent?
Answer: In the year
Round to the nearest actual year.
