Year	% gross
1971	81.705192565918
1972	82.6721115112305
1973	89.1846923828125
1974	89.2652206420898
1975	90.3705368041992
1976	88.9441680908203
1977	89.8387069702148
1978	91.0168609619141
1979	93.7403106689453
1980	94.7561874389648
1981	95.6106109619141
1982	96.607307434082
1983	97.9789733886719
1984	99.2340927124023
1985	100.03491973877
1986	99.9634475708008
1987	98.70751953125
1988	98.0106430053711
1989	99.8093719482422
1990	104.718772888184
1991	107.158653259277
1992	108.906150817871
1993	113.679702758789
1994	124.662437438965
1995	113.313552856445
1996	111.782989501953
1997	114.135971069336
1998	117.324676513672
1999	120.932861328125
2000	118.078102111816
2001	116.061431884766
2002	114.660079956055
2003	114.726753234863
2004	115.898513793945
2005	112.202201843262
2006	111.259620666504
2007	110.908531188965
2008	110.293609619141
2009	109.753890991211
2010	112.210998535156
2011	112.686630249023
2012	111.270492553711
2013	112.620422363281
2014	111.40682220459
2015	113.484977722168
2016	115.005500793457
2017	115.061729431152
2018	115.596313476562
2019	116.849769592285
2020	117.254188537598
2021	117.828887939453