In what year did the U.S. not participate in the Summer Olympics?
1980
1980
1980
1980
1932
1980
1924
2024
1980
1932
1960
1976
1924
1980
1904
1932
1960
1976
1980
1972
1924
1988
2024
1960
1904
1976
1932
1980
1972
2016
1988
1984
1924
1960
1976
1968
1904
1980
1972
2016
1988
1948
2020
1984
1960
1976
1932
1908
1968
1980
2024
1972
2016
1912
1988
1948
1904
2020
1984
1924
1960
1976
1968
1980
1972
2016
1932
1908
1988
1948
2020
1984
1964
1912
1960
1904
1976
2012
1924
1968
1992
1980
1972
2016
1988
1948
2028
2020
1984
1964
1908
1960
1976
2024
2012
1912
1968
1904
1992
1980
1972
2016
1932
1988
1948
2020
1984
1964
1996
1960
2008
2028
1976
1952
2012
1924
1908
1968
1992
1980
1972
2016
2000
1912
1988
1948
1904
2020
1984
1964
1996
1932
1960
2008
1976
1952
2012
1968
2028
1992
1980
1972
2016
1924
2000
1908
1988
1948
2020
1984
1964
1996
1912
1960
2008
1904
1976
1952
2012
1920
1968
1992
1980
1972
2016
2000
1988
1948
2028
2020
1984
1964
1996
1932
1908
1960
1956
2008
1976
1952
2012
1912
1920
1968
1904
1992
1980
1972
2016
1924
2000
1988
1948
2020
1984
1964
1996
1960
1956
2008
1976