Year	% gross
1970	3.44636988639832
1971	3.48536992073059
1972	3.8136100769043
1973	4.03550004959106
1974	4.07282018661499
1975	4.98119020462036
1976	5.81452989578247
1977	6.95590019226074
1978	8.55494022369385
1979	7.74736976623535
1980	10.3433904647827
1981	10.1520500183105
1982	9.87769031524658
1983	11.0206899642944
1984	10.3964700698853
1986	11.6754198074341
1990	11.4213304519653
1991	11.9523296356201
1992	12.4357404708862
1993	12.7493200302124
1994	13.1665601730347
1995	13.429160118103
1996	14.5589504241943
1997	15.2411098480225
1998	12.0330495834351
1999	15.8898801803589
2000	20.0150108337402
2003	28.6110897064209
2004	28.8337306976318
2005	28.7926692962646
2006	31.8918399810791
2007	32.9436111450195
2008	35.4499816894531
2009	36.1042213439941
2010	38.9609413146973
2011	39.7956085205078
2012	38.8648414611816
2013	38.3778114318848
2014	38.5680503845215
2015	37.1512718200684
2016	38.6994590759277
2017	40.8084411621094
2018	40.5796089172363
2019	39.0427207946777
2020	38.6312294006348
2021	33.2354507446289