Year	% gross
1981	4.24327993392944
1987	8.52812957763672
1988	8.8390998840332
1989	8.68148994445801
1990	8.24172973632812
1991	8.36124992370605
1992	9.05642032623291
1993	9.35517978668213
1994	10.2603101730347
1995	10.8335800170898
1996	10.4352703094482
1997	10.6534004211426
1998	13.34255027771
1999	14.11083984375
2000	14.8095998764038
2001	17.3507499694824
2002	17.5051193237305
2003	18.8694000244141
2004	19.7467098236084
2005	20.2957305908203
2006	20.4756298065186
2008	16.8435707092285
2009	17.59547996521
2010	18.0564804077148
2011	19.9474906921387
2012	23.8424892425537
2013	27.8582401275635
2014	27.9760303497314
2015	28.7535095214844
2016	30.447380065918
2017	30.6699600219727
2018	34.6797714233398
2019	37.5091590881348
2020	36.2933502197266