Year	% gross
1971	15.0660800933838
1972	19.5581207275391
1973	22.9335403442383
1974	24.9263801574707
1976	26.882999420166
1977	28.6584892272949
1978	30.254150390625
1979	27.1269607543945
1980	28.4531898498535
1981	28.5960502624512
1982	28.8918590545654
1983	28.9676609039307
1984	29.1287708282471
1985	28.8407592773438
1986	28.4521408081055
1987	29.0169506072998
1988	30.7802600860596
1989	33.0084609985352
1990	36.5929412841797
1991	40.4275093078613
1992	43.3324203491211
1993	45.9026489257812
1994	47.5237083435059
1995	47.9164390563965
1996	52.4707107543945
1998	59.7040100097656
1999	64.6375198364258
2000	67.535400390625
2001	70.1432800292969
2002	74.6764678955078
2003	79.8572998046875
2004	87.9052276611328
2005	94.2599868774414
2006	91.7599029541016
2007	91.8613586425781
2008	88.7312088012695
2009	87.0825424194336
2010	86.1018829345703
2011	89.3833618164062
2012	91.0465087890625
2013	93.4175262451172
2014	95.1246566772461
2015	97.2847137451172
2016	94.9557800292969
2017	94.04833984375
2018	93.8774719238281
2019	94.8741226196289
2020	96.1319580078125
2021	97.5408096313477
2022	98.9318313598633