Year	% gross
1970	5.82524013519287
1971	4.74687004089355
1972	4.71339988708496
1973	4.65937995910645
1974	4.63612985610962
1975	5.61236000061035
1976	5.70141983032227
1977	5.81345987319946
1978	4.7361102104187
1979	4.71323013305664
1980	4.75426006317139
1981	4.808189868927
1982	4.86279010772705
1983	4.98847007751465
1984	5.14269018173218
1985	5.26338005065918
1986	5.32547998428345
1987	5.29851007461548
1988	5.56591987609863
1989	5.78000020980835
1990	6.10606002807617
1991	6.15495014190674
1992	6.5460901260376
1993	6.81677007675171
1994	7.14843988418579
1995	7.54766988754272
1996	8.51811027526855
1997	8.65948963165283
1998	9.47661018371582
1999	9.43000984191895
2000	10.1514301300049
2001	11.263819694519
2002	11.5609903335571
2003	12.3376903533936
2004	12.903920173645
2005	13.4095897674561
2006	13.5630702972412
2007	14.6223497390747
2008	16.098949432373
2009	18.0014705657959
2010	18.4926300048828
2011	19.4782295227051
2012	20.7427406311035
2013	21.4927501678467
2014	22.0025196075439
2015	22.619140625
2016	22.6065807342529
2017	23.5993499755859
2018	23.8512096405029
2019	24.6446704864502
2020	25.1715507507324
2021	25.5613193511963