In what year did Black Sabbath reunite?
1997
1975
1975
1975
1975
1975
1977
1973
1980
1975
1976
1977
1973
1980
1990
1975
1976
1977
1973
1980
1990
1975
1976
1977
1973
1980
1990
1975
1976
1970
1991
1977
1973
1980
1990
1975
1976
1970
1991
1977
1973
1980
1990
1975
1976
1988
1970
1991
1977
1973
1992
1980
1990
1975
1976
1972
1988
1970
1991
1977
1995
1993
1973
1992
1996
1980
1990
1975
1989
1976
1972
2000
1988
1974
1970
2001
1991
1977
1995
1993
1973
1992
1996
1980
1990
1975
1989
1976
1972
1997
2000
1988
1974
1970
2001
1991
1977
1995
1993
1973
1992
1987
1996
1980
1990
1975
1989
1976
1972
1997
2000
1988
1979
1974
1970
2001
1991
1977
1995
1993
1973
1992
1981
1987
1996
1980
1990
1975
1989
1976
1972
1997
2000
1988
1979
1974
1970
2001
2016
1991
1977
1995
1993
1973
1992
1981
1987
1996
1980
1990
1975
1989
1976
1972
1997
2000
1988
1979
1974
1970
2001
2016
1991
1978
1977
1995
1993
1973
1992
1981
1987
1996
1980
1990
1975
1989
1976
1972
1997
2000
1971
1988
1979
1974
1983
1970
2001
2016
1991
1978
1977
1995
1993
1973
1992
1994
1981
1987
1996
1980
1990