Year	% gross
1970	15.6398496627808
1971	15.7739295959473
1972	16.2116203308105
1973	16.5369396209717
1974	16.7756500244141
1975	17.4828701019287
1976	18.1502094268799
1977	18.8176708221436
1978	19.7811908721924
1979	20.9815692901611
1980	22.4847297668457
1981	23.7999591827393
1982	25.329610824585
1983	27.4583892822266
1984	29.2537994384766
1985	28.9360694885254
1986	27.4840793609619
1987	27.1812896728516
1988	26.9036502838135
1989	26.0298500061035
1990	26.0868797302246
1991	26.1962604522705
1992	25.8901405334473
1993	25.9369201660156
1994	26.1765308380127
1995	26.446159362793
1996	26.5750102996826
1997	26.6066398620605
1998	27.2015991210938
1999	27.48410987854
2000	28.3308601379395
2001	29.8660202026367
2002	31.3146896362305
2003	32.4463996887207
2004	34.2183418273926
2005	35.118049621582
2006	36.3071098327637
2007	37.5232315063477
2008	39.2876815795898
2009	40.9900398254395
2010	42.8696708679199
2011	44.0341110229492
2012	44.9129486083984
2013	47.3918991088867
2014	46.0747718811035
2015	46.4925689697266
2016	45.7432594299316
2017	45.7445106506348
2018	45.7441787719727
2019	46.2024612426758
2020	46.5811195373535
2021	46.966869354248
2022	46.734058380127