Year	% gross
1970	86.9562225341797
1971	86.9634399414062
1972	88.0611801147461
1973	87.8594818115234
1974	87.572639465332
1975	87.5312576293945
1976	87.6972122192383
1977	88.1343231201172
1978	88.2373962402344
1979	83.1467590332031
1980	95.6284408569336
1981	94.7610397338867
1982	97.9887771606445
1983	97.3326568603516
1984	98.1776809692383
1985	96.601936340332
1986	97.0958862304688
1987	97.4790420532227
1988	97.1619720458984
1989	96.8465805053711
1990	96.4796905517578
1991	95.5374221801758
1992	96.2209625244141
1993	96.9813766479492
1994	97.0060195922852
1995	95.1752319335938
1996	94.9397201538086
1997	95.1897430419922
1998	95.4402618408203
1999	95.1175689697266
2000	95.2198333740234
2001	95.2798461914062
2002	95.342903137207
2003	95.4023513793945
2004	95.4656524658203
2005	95.5295486450195
2006	95.674919128418
2007	95.878547668457
2008	96.0960922241211
2009	96.2878723144531
2010	96.3723678588867
2011	96.5288162231445
2012	97.3746566772461
2013	97.5356597900391
2014	98.2207565307617
2015	98.8826217651367
2016	99.890380859375
2017	100.062713623047
2018	100.331047058105
2019	101.006813049316
2020	101.356010437012
2021	101.913803100586
2022	101.891227722168