Year	% gross
1971	10.3059301376343
1972	9.75496959686279
1973	9.77025032043457
1974	9.26953983306885
1975	10.1202096939087
1976	10.6478204727173
1977	11.8170604705811
1978	12.5964498519897
1979	14.0230798721313
1980	14.8555898666382
1981	15.9662704467773
1982	16.0441303253174
1983	15.3502101898193
1984	14.5183401107788
1985	13.9788303375244
1986	13.2646903991699
1987	10.9755802154541
1988	9.54856014251709
1989	8.74238967895508
1990	8.39474964141846
1991	9.67516040802002
1992	11.7420301437378
1993	13.5671997070312
1994	14.565770149231
1995	14.7001495361328
1996	17.8319702148438
1997	18.7607593536377
1998	18.9140205383301
1999	21.2228603363037
2000	21.982629776001
2001	25.5758094787598
2002	30.0816192626953
2003	34.8545188903809
2004	37.0642204284668
2005	40.4289894104004
2006	47.1162185668945
2007	51.6757011413574
2008	62.315071105957
2009	68.9912261962891
2010	63.4508094787598
2011	56.8756713867188
2012	48.668041229248
2013	45.7512512207031
2014	45.5387496948242
2015	47.273120880127
2016	44.725269317627
2017	45.5519218444824
2018	46.6906318664551
2019	46.5691108703613
2020	49.997371673584
2021	48.2235488891602