Year	% gross
1981	22.7757797241211
1986	20.1862506866455
1988	20.2832298278809
1989	20.3373107910156
1990	21.1484603881836
1991	21.2197799682617
1992	20.9864807128906
1993	20.7342300415039
1994	20.3787994384766
1995	20.2736301422119
1999	16.6886405944824
2000	17.3820896148682
2001	16.8270893096924
2002	16.9800605773926
2003	18.3003902435303
2004	19.535680770874
2005	20.0739994049072
2006	21.2028503417969
2007	22.1728801727295
2008	22.6387195587158
2009	22.4301891326904
2010	22.7603607177734
2011	22.2888793945312
2012	22.7133293151855
2013	22.7680702209473
2014	24.4802207946777
2015	26.4624404907227
2016	29.1225490570068
2017	31.114070892334