When was Iron Maiden's debut studio album released?
1980
1980
1980
1975
1972
1980
1975
1972
1980
1975
1972
1981
1980
1973
1975
1970
1972
1981
1980
1973
1975
1970
1972
1981
1984
1980
1973
1975
1970
1972
1981
1984
1980
1973
1982
1975
1976
1970
1972
1981
1984
1979
1980
1973
1982
1975
1976
1970
1972
1977
1974
1981
1984
1979
1980
1973
1982
1975
1976
1970
1972
1977
1974
1978
1981
1984
1979
1980
1973
1982
1975
1976
1970
1968
1972
1977
1974
1978
1981
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1977
1974
1978
1981
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1977
1974
1978
1981
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1969
1977
1974
1978
1981
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1969
1977
1974
1978
1981
1983
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1969
1977
1974
1978
1981
1983
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1969
1977
1974
1978
1981
1983
1984
1979
1980
1973
1982
1975
1976
1970
1971
1968
1972
1969
1977
1974
1978
1981
1983
1984
1979
1980
1973
1982
1975
1975.
1980.