Many students from Europe come to the United States for their college education.

From 1980 through 1990, the number S(in thousands), of European students

attending a college or university in the U.S. can be modeled by

S=0.05(t3 - 11ť + 45t +277), where t = Ocorresponds to 1980.

In what year were there 31.35 thousand European students attended a U.S. college

or university?