Year	% gross
1971	3.38950991630554
1972	3.71800994873047
1973	3.92183995246887
1974	8.58619976043701
1975	9.09255027770996
1976	9.3772497177124
1977	12.7536602020264
1978	13.0434799194336
1979	13.4553804397583
1980	15.856559753418
1981	20.091480255127
1982	22.9698696136475
1983	23.800329208374
1984	25.1761093139648
1985	25.5442504882813
1986	28.8268508911133
1987	31.4279193878174
1988	30.8133296966553
1991	50.8361511230469
1993	54.0556793212891
1994	56.2372512817383
1995	57.2478713989258
1996	61.3182907104492
1998	65.5783615112305
1999	68.3422012329102
2000	72.4476318359375
2001	74.6382369995117
2003	78.0410766601563
2004	78.5785675048828
2005	79.8373413085938
2006	80.7182998657227
2007	80.434211730957
2008	81.7745132446289
2009	85.2253723144531
2010	88.2374801635742
2011	91.9844665527344
2012	92.5441284179688
2013	92.1346969604492
2014	92.9712066650391
2015	94.1286392211914
2016	94.550163269043
2017	94.5576171875
2018	91.4367370605469
2019	94.4905319213867
2020	99.6426467895508