Year	% gross
1979	15.3041296005249
1980	15.6077604293823
1981	14.9113597869873
1982	14.7146100997925
1983	14.6134796142578
1984	14.6397104263306
1985	14.7604503631592
1986	14.888409614563
1987	15.3137302398682
1988	15.4921197891235
1989	15.4511404037476
1990	15.5240001678467
1991	15.5670404434204
1992	15.5791397094727
1993	15.6080703735352
1994	15.191370010376
1995	15.2372999191284
1996	15.327130317688
1997	15.3929996490479
1998	15.5703201293945
1999	11.7131204605103
2000	13.350640296936
2001	13.3737802505493
2002	14.8831701278687
2003	16.4979000091553
2004	19.1485805511475
2005	18.9997806549072
2006	21.3155307769775
2007	22.7022800445557
2008	21.9482593536377
2009	23.2270107269287
2010	24.4481906890869
2011	29.0362205505371
2012	33.8703117370605
2013	38.7564582824707
2014	20.712760925293
2015	23.4487209320068
2016	23.1947498321533
2017	23.4267997741699
2018	23.3404197692871
2019	23.8284893035889
2020	24.1733207702637