Year	% gross
1971	0.205970004200935
1972	0.268810003995895
1973	0.277579993009567
1974	0.264450013637543
1975	0.224319994449615
1978	0.207120001316071
1979	0.213170006871223
1981	0.189820006489754
1982	0.222420006990433
1983	0.22503000497818
1984	0.237139999866486
1985	3.18009996414185
1986	4.50614023208618
1987	3.9543399810791
1988	3.88632988929749
1989	3.97365999221802
1990	4.20310020446777
1991	4.51412010192871
1992	5.02715015411377
1993	5.19844007492065
1994	5.52661991119385
1995	5.75713014602661
1997	6.83936977386475
1998	7.15124988555908
1999	6.80279016494751
2000	6.52913999557495
2001	6.68273019790649
2002	7.38290977478027
2003	8.0675802230835
2004	8.94169044494629
2005	10.860969543457
2006	13.7868299484253
2007	16.1882495880127
2008	17.9324493408203
2009	20.8057994842529
2010	25.4554100036621
2011	28.9796199798584
2012	30.2375202178955
2013	27.6796493530273
2014	26.974100112915
2015	29.1438007354736
2016	30.173210144043
2017	32.7392692565918
2018	36.6724281311035
2019	37.9658088684082
2020	39.7459297180176