Year	% gross
1971	3.92138004302979
1972	4.4039101600647
1973	5.22275018692017
1974	5.86882019042969
1975	6.69216012954712
1976	7.89107990264893
1977	8.68194007873535
1978	9.19472026824951
1979	9.62430953979492
1980	10.0588502883911
1981	10.934229850769
1982	11.6667995452881
1983	12.2068395614624
1984	12.460410118103
1985	12.1803703308105
1986	10.8762702941895
1987	10.4848299026489
1988	11.7480697631836
1989	10.2561597824097
1990	9.64068031311035
1991	8.59519958496094
2001	24.9822692871094
2002	26.443790435791
2003	24.6022205352783
2004	24.7853908538818
2005	26.3567695617676
2006	26.914680480957
2007	25.2448101043701
2008	28.0469799041748
2009	28.0995998382568
2010	29.2879295349121
2011	24.7804203033447
2012	25.1834392547607
2013	27.1532096862793
2014	27.8057994842529
2015	32.4894790649414
2016	32.5847702026367
2017	33.958381652832
2018	37.7170791625977
2020	39.7496109008789
2022	38.0330085754395