Year	% gross
1971	79.242431640625
1972	80.8525619506836
1973	82.2350387573242
1974	82.9335403442383
1975	83.3385696411133
1976	83.4636535644531
1977	85.5340805053711
1978	88.375602722168
1979	89.7992782592773
1980	91.5083389282227
1981	93.0070190429688
1982	94.7232666015625
1983	95.4854431152344
1984	97.2211608886719
1985	99.3859634399414
1986	100.43775177002
1987	101.029403686523
1988	102.768699645996
1989	104.040267944336
1990	105.144790649414
1991	105.218162536621
1992	105.449668884277
1993	146.784393310547
1994	147.659408569336
1995	149.404663085938
1996	149.139419555664
1999	148.247543334961
2000	154.356338500977
2001	164.421981811523
2002	166.829498291016
2003	166.853012084961
2004	158.973358154297
2005	166.336334228516
2006	168.262008666992
2007	169.791259765625
2008	171.841247558594
2009	171.172912597656
2010	171.341003417969
2011	170.005645751953
2012	171.274078369141
2013	172.689697265625
2014	172.866333007812
2015	174.837173461914
2016	170.400466918945
2017	168.216491699219
2018	165.985092163086
2019	166.064483642578
2020	160.896133422852
2021	150.585006713867