Year	% gross
1971	36.5334587097168
1972	39.2858581542969
1973	41.7699012756348
1974	43.4753684997559
1975	43.9545211791992
1976	45.2808685302734
1977	45.873348236084
1978	47.1505317687988
1979	48.2920684814453
1980	47.1697311401367
1981	46.4919509887695
1982	46.7982788085938
1983	48.3963317871094
1984	50.9214286804199
1985	52.7999992370605
1986	54.319938659668
1987	54.9213981628418
1988	53.8587112426758
1989	52.5645790100098
1990	50.2410011291504
1991	48.0874900817871
1992	45.9475402832031
1993	45.2229881286621
1994	44.2423515319824
1995	43.3788986206055
1996	42.5746917724609
1997	42.5535011291504
1998	43.3871192932129
1999	43.599048614502
2000	44.2224617004395
2001	45.6095314025879
2002	47.2403984069824
2003	62.5764198303223
2004	65.7855911254883
2005	69.1803817749023
2006	70.6653137207031
2007	71.2925567626953
2008	71.661491394043
2009	72.8768615722656
2010	73.8691177368164
2011	75.2352905273438
2012	75.7306976318359
2013	48.9635314941406
2020	37.9215202331543
2021	38.2289009094238
2022	38.4870300292969
2023	38.6241989135742