Year	% gross
1970	13.3099298477173
1971	13.4134197235107
1972	13.7724103927612
1973	14.0854597091675
1974	14.2776002883911
1975	14.7816696166992
1976	15.2671804428101
1977	15.751540184021
1978	16.5342807769775
1979	17.4059391021729
1980	18.537769317627
1981	19.7116603851318
1982	21.0575695037842
1983	22.3192195892334
1984	23.4860095977783
1985	24.0462303161621
1986	23.7194499969482
1987	23.7245101928711
1988	23.4989204406738
1989	22.760139465332
1990	22.9744491577148
1991	23.2047805786133
1992	23.0252799987793
1993	23.130729675293
1994	23.4071006774902
1995	23.9148006439209
1996	24.1278495788574
1997	24.1755294799805
1998	24.7201309204102
1999	24.9929504394531
2000	25.5493793487549
2001	26.8518009185791
2002	27.84255027771
2003	28.951509475708
2004	30.4780807495117
2005	31.3897304534912
2006	32.4221000671387
2007	33.3528709411621
2008	35.2937202453613
2009	37.0730590820312
2010	38.9914588928223
2011	40.1870498657227
2012	41.4295616149902
2013	44.0412483215332
2014	42.8448791503906
2015	43.3706283569336
2016	42.8496589660645
2017	43.0901489257812
2018	43.2764015197754
2019	43.8056602478027
2020	44.3791809082031
2021	44.7816696166992
2022	44.6213912963867