Year	% gross
1971	8.91670989990234
1972	9.16911029815674
1980	20.2124004364014
1981	18.3166999816895
1982	16.5602893829346
1983	16.9699096679688
1985	16.7484607696533
1992	22.9754791259766
1996	21.6541500091553
1999	28.9246692657471
2000	29.8073692321777
2001	33.8664817810059
2002	36.043830871582
2003	36.4954795837402
2004	37.3048515319824
2005	39.8581085205078
2006	41.5036392211914
2007	44.8759498596191
2008	46.878978729248
2009	46.1637916564941
2010	46.4237785339355
2011	49.2260818481445
2012	49.7366905212402
2013	53.3673782348633
2014	48.3984718322754
2015	40.5686416625977
2016	48.2518501281738
2017	50.2691993713379
2018	54.2573318481445
2019	57.3723907470703