Year	% gross
1971	0.246539995074272
1972	0.410890012979507
1973	0.730239987373352
1974	1.12244999408722
1975	1.11394000053406
1976	1.20866000652313
1978	1.70167005062103
1979	1.50618994235992
1982	2.62631988525391
1983	2.908940076828
1984	2.94488000869751
1985	3.06682991981506
1986	3.77841997146606
1987	3.58897995948792
1988	3.56704998016357
1991	4.05174016952515
1992	3.72332000732422
1993	3.36244010925293
1994	3.2530300617218
1995	3.38543009757996
1996	3.37826991081238
1997	4.09785985946655
1999	5.16187000274658
2000	5.83298015594482
2001	7.01627016067505
2006	9.80243968963623
2007	11.5696001052856
2008	11.1521797180176
2009	13.9758195877075
2010	19.3092002868652
2011	19.1779708862305
2012	19.7113399505615
2013	22.013240814209
2014	22.0755004882812
2015	18.2580699920654
2016	17.2573795318604
2017	16.1748504638672
2018	16.2293796539307
2019	14.4879102706909
2020	14.1525602340698
2021	13.0384302139282