Year	% gross
1971	6.93758010864258
1972	8.11231994628906
1973	10.51881980896
1974	12.7597398757935
1976	28.4571399688721
1977	32.1905517578125
1978	31.2844696044922
1979	32.3714981079102
1980	29.1568908691406
1981	22.0239505767822
1982	20.7105598449707
1983	18.8512897491455
1984	18.3832302093506
1985	15.8893604278564
1986	13.9961595535278
2007	23.3916606903076
2021	8.44799995422363
2023	21.1983299255371