In what year did the U.S. not participate in the Summer Olympics?
1980
1912
1912
1908
1912
1908
1912
1908
1932
1912
1908
1924
1932
1912
1908
1948
1924
1932
1912
1908
1948
1924
1904
1948
1932
1912
1908
1924
1948
1904
1932
1912
1908
1948
1924
1904
1932
1912
1908
1948
1924
1904
1948
1932
1912
1908
1964
1924
1948
1904
1964
1932
1912
1936
1908
1948
1924
1964
1936
1904
1932
1912
1908
1948
1964
1936
1924
1904
1948
1932
1912
1908
1972
1964
1936
1924
1939
1948
1904
1972
1964
1932
1912
1928
1936
1908
1948
1924
1939
1972
1964
1928
1936
1904
1932
1912
1976
1908
1948
1972
1964
1928
1936
1924
1939
1904
1976
1948
1932
1912
1908
1972
1964
1928
1936
1976
1924
1939
1948
1904
1972
1964
1932
1912
1928
1936
1908
1976
1948
1924
1939
1972
1964
1928
1936
1904
1932
1912
1976
1908
1948
1948 Summer Olympics
1972
1964
1928
1936
1924
1939
1904
1976
1948
1952
1932
1912
1908
1972
1964
1928
1936
1976
1924
1939
1948
1952
1948 Summer Olympics
1904
1972
1980
1964
1932
1928
1936
1956
1908
1920
1976
1924
1939
1972
1980
1940
1964
1924.
1928
1936
1904
1956
1932
1976
1984
1952
1972
1980
1964
1928
1936
1956
1924
1939
1932.
1920