Year	% gross
1971	3.22904992103577
1976	4.76945018768311
1977	4.98441982269287
1978	5.10011005401611
1979	6.39423990249634
1980	6.99838018417358
1981	7.40207004547119
1983	7.15596008300781
1984	8.97529983520508
1985	10.3135595321655
1986	11.24534034729
1987	12.1275300979614
1988	13.1863298416138
1989	12.4219303131104
1990	11.9948396682739
1991	11.7002000808716
1992	11.3749904632568
1994	10.5567102432251
1995	10.3459396362305
1997	9.37594032287598
1998	9.76307964324951
1999	11.1937303543091
2000	12.7288103103638
2001	12.7686595916748
2002	13.2040300369263
2003	13.5244398117065
2004	16.8748397827148
2005	18.040979385376
2006	17.7609806060791
2007	19.1242599487305
2008	22.3314895629883
2009	23.4972591400146
2010	25.1752891540527
2011	26.2716293334961
2012	29.2482490539551
2014	33.4907989501953
2015	36.7471389770508
2016	38.3159217834473
2017	35.5958099365234
2018	34.1354103088379
2019	35.2497596740723