Year	% gross
1971	88.13037109375
1972	88.3889007568359
1973	90.0797119140625
1974	91.3007736206055
1975	89.7848510742188
1976	92.0818023681641
1977	92.2698822021484
1978	90.6338577270508
1979	90.5220031738281
1981	91.7813110351562
1982	94.7168121337891
1984	102.798667907715
1985	102.262962341309
1986	102.618270874023
1987	101.979843139648
1988	103.951522827148
1989	101.189888000488
1990	101.94172668457
1991	101.79808807373
1992	101.805282592773
1993	99.2217025756836
1994	96.7377700805664
1995	95.6576995849609
1997	94.0157775878906
1999	96.7917175292969
2000	101.65950012207
2001	104.008796691895
2002	104.928726196289
2003	101.818412780762
2004	102.24584197998
2005	102.7470703125
2006	103.410263061523
2007	104.149971008301
2008	102.199951171875
2009	101.680648803711
2010	104.545227050781
2011	105.980278015137
2012	104.680419921875
2013	115.074432373047
2014	112.405212402344
2015	107.572982788086
2016	105.592681884766
2017	97.5539016723633
2018	100.87230682373
2019	103.790626525879
2020	102.976020812988
2021	102.186958312988