ϸ, ġ ã ϴ. , Ѿ, ܶ, ã ƴϴ. ۵ ϱ , ϴ. EduLab ̾߱⸦ ϴ , å ȹϰ Ǿ. ְ ڷ̸鼭, ̾ ϰ, ϴ. , ̾ ε巴, зδ㵵 ٰ ִ. ̿ ߿ ϰ Ǿ, å <ְ ̱ >, <ְ 100> ϰ Ǿ. з, ý ø ǵǾ. ֱ å , , ִ. ̸ Ȱϸ ٷιٷ ã ְ, ܾ嵵 ִ.
1949 - Harry S. Truman
1953 - Dwight D. Eisenhower
1957 - Dwight D. Eisenhower
1961 - John F. Kennedy
1965 - Lyndon B. Johnson
1969 - Richard Nixon
1973 - Richard Nixon
1977 - Jimmy Carter
1981 - Ronald Reagan
1985 - Ronald Reagan