Year	% gross
1970	47.1843109130859
1971	47.3759307861328
1972	48.1211090087891
1973	50.4270896911621
1974	52.878490447998
1975	55.9193992614746
1976	58.0102615356445
1977	58.4077491760254
1978	58.3471984863281
1979	58.3006706237793
1980	59.2674102783203
1981	59.5021018981934
1982	60.3340110778809
1983	61.636058807373
1984	63.5782318115234
1985	64.4718017578125
1986	66.1573028564453
1987	67.2503280639648
1988	67.9831237792969
1989	67.1775817871094
1990	68.6658782958984
1991	70.4031219482422
1992	70.7922821044922
1993	71.6739273071289
1994	72.7223663330078
1995	72.9503173828125
1996	73.8524932861328
1997	73.2700881958008
1998	76.0129928588867
1999	75.9452667236328
2000	75.2340087890625
2001	76.6291275024414
2002	78.201789855957
2003	79.8174591064453
2004	79.7330932617188
2005	82.8479385375977
2006	79.6394119262695
2007	79.5214385986328
2008	79.7183990478516
2009	79.7118301391602
2010	81.179557800293
2011	82.7976226806641
2012	83.9528503417969
2013	84.2755279541016
2014	81.8271102905273
2015	85.0383224487305
2016	85.9721221923828
2017	85.7317581176758
2018	85.4242782592773
2019	86.2900085449219
2020	86.0943603515625