Year	% gross
1981	20.2901496887207
1986	21.7847309112549
1989	19.04953956604
1990	21.0180492401123
1991	19.2663707733154
1992	18.0733890533447
1993	16.7045707702637
1994	16.4450092315674
1995	19.0732707977295
1996	18.1991596221924
1997	17.2776393890381
1998	16.8631000518799
1999	18.0730590820313
2000	19.2713298797607
2001	20.8984909057617
2002	22.367259979248
2003	23.4206008911133
2004	24.0811405181885
2005	25.4499797821045
2006	26.7482109069824
2007	26.0570907592773
2008	24.1597499847412
2009	23.530969619751
2010	25.5829391479492
2011	26.5576591491699
2012	24.8493309020996
2013	25.7365303039551
2014	23.1055393218994
2015	23.875789642334
2016	22.7368698120117
2017	35.9799995422363
2018	39.712329864502
2019	41.1387214660645
2020	44.685131072998
2021	46.2895889282227