Year	% gross
1970	28.4125308990479
1971	30.1841201782227
1972	29.5911197662354
1974	31.9872207641602
1975	33.6301307678223
1976	35.5587387084961
1977	37.9881591796875
1978	39.2170600891113
1979	39.0602493286133
1980	41.0941200256348
1981	43.0771484375
1982	48.2713012695312
1983	51.5045509338379
1984	56.2956581115723
1985	61.0903091430664
1986	63.8985786437988
1987	65.1169662475586
1988	64.9762496948242
1989	62.7176818847656
1990	63.3882484436035
1991	64.6676177978516
1992	56.9656600952148
1993	61.4505195617676
1994	66.7831878662109
1995	63.4546012878418
1996	65.1532669067383
1997	108.590408325195
1998	115.871391296387
1999	121.182929992676
2000	123.614189147949
2001	127.171463012695
2002	132.262252807617
2003	132.582214355469
2004	124.559150695801
2005	118.848907470703
2006	118.314170837402
2007	117.733726501465
2008	121.010612487793
2009	122.685317993164
2010	120.478988647461
2011	113.17162322998
2012	112.959381103516
2013	111.736518859863
2014	112.858001708984
2015	103.815582275391
2016	106.762680053711
2017	106.23526763916