Year	% gross
1970	9.53493976593018
1971	9.56169033050537
1972	9.86567974090576
1973	10.3866100311279
1974	10.4778203964233
1975	11.190299987793
1976	11.7722396850586
1977	12.4988203048706
1978	13.2548704147339
1980	16.9043502807617
1981	19.6593608856201
1982	14.3630895614624
1984	17.0828800201416
1985	17.4886608123779
1986	20.0451393127441
1988	24.7973899841309
1989	24.0666198730469
1990	23.9793891906738
1991	24.9300498962402
1993	18.2478103637695
1994	30.8719100952148
1995	32.4692306518555
1999	4.08202981948853
2000	0
2001	0
2002	46.8571090698242
2003	68.6276473999023
2004	63.2947311401367
2005	73.1886520385742
2006	79.2162399291992
2007	76.4081268310547
2008	80.1194763183594
2009	78.6424026489258
2010	83.1149520874023
2011	83.3764724731445
2012	88.89306640625
2013	88.7339706420898
2014	89.5568466186523
2015	85.9023666381836
2016	85.787956237793
2017	85.5634918212891
2018	86.1901321411133
2019	88.3335800170898