Year	% gross
1970	3.1229100227356
1971	2.49529004096985
1972	2.54216003417969
1973	2.31119990348816
1974	2.49513006210327
1975	2.39484000205994
1976	2.71983003616333
1977	2.62579011917114
1978	2.15156006813049
1979	4.20944023132324
1980	6.8299298286438
1982	8.13206005096436
1983	10.3223495483398
1984	12.17453956604
1985	12.3652400970459
1986	13.9765100479126
1987	14.4521799087524
1988	13.7487697601318
1989	11.9053602218628
1990	11.4984302520752
1991	12.4541501998901
1992	12.1143198013306
1993	14.4757099151611
1994	17.6434803009033
1995	17.9867305755615
1996	20.9223899841309
1997	24.0507507324219
1998	26.0884304046631
1999	29.1662693023682
2000	30.518030166626
2001	30.3389205932617
2002	33.2557182312012
2003	34.8562202453613
2004	38.0989990234375
2005	41.0334815979004
2006	53.9137916564941
2007	55.0849990844727
2008	56.4659805297852
2010	55.5950202941895
2011	58.7239189147949
2012	60.9207992553711
2013	59.4396018981934
2014	63.2529983520508
2015	62.8419990539551
2016	66.913688659668
2017	72.191032409668
2018	70.7942581176758
2019	70.0163803100586
2020	69.0436401367188