Year	% gross
1971	2.15664005279541
1972	2.35837006568909
1977	3.08282995223999
1978	3.24909996986389
1980	4.16044998168945
1981	4.51178979873657
1982	4.09076023101807
1984	3.58289003372192
1985	3.65460991859436
1992	4.77034997940063
2006	7.66766023635864
2007	8.15676975250244
2008	10.1575298309326
2009	10.0303602218628
2010	9.55704021453857
2011	12.6396799087524
2012	12.7863302230835
2013	13.139760017395
2014	13.5933103561401
2015	13.6365003585815
2016	13.9123096466064
2017	14.6425895690918
2018	15.5097398757935
2019	15.2362604141235
2020	15.9158802032471
2021	16.39035987854
2022	17.0387496948242