Year	% gross
1971	10.2578897476196
1972	11.4400796890259
1973	12.9722604751587
1974	14.9088201522827
1975	15.7608804702759
1976	16.7367095947266
1977	20.8376998901367
1978	21.2530708312988
1979	22.3183898925781
1980	24.1180000305176
1981	25.1619606018066
1982	26.6397304534912
1983	28.5218200683594
1984	29.519100189209
1985	30.3455791473389
1986	31.1970500946045
1987	33.2425384521484
1988	34.8671798706055
1989	37.0289993286133
1990	42.2177810668945
1991	46.1026802062988
1992	50.2877998352051
1993	55.2847213745117
1994	59.9804306030273
1995	60.983959197998
1996	66.7112731933594
1997	72.7014007568359
1998	74.4989776611328
1999	79.0109786987305
2000	83.0321273803711
2001	84.3133392333984
2002	87.8197708129883
2003	94.8216094970703
2004	95.3977127075195
2005	95.1597366333008
2006	95.1598510742188
2007	94.8026428222656
2008	91.5216522216797
2009	91.2951889038086
2010	89.4883270263672
2011	87.4236907958984
2012	88.3658599853516
2013	91.6439895629883
2014	93.1533203125
2015	94.5918426513672
2016	98.7419967651367
2017	101.069969177246
2018	102.747032165527
2019	103.331268310547
2020	105.44522857666
2021	113.759750366211