Year	% gross
1970	21.1122493743896
1971	20.9551601409912
1972	22.3881206512451
1974	25.5683498382568
1976	30.7571697235107
1977	33.4120407104492
1978	33.4951515197754
1979	37.2929382324219
1980	47.4579811096191
1981	52.7966995239258
1982	55.2618713378906
1983	58.9966583251953
1984	60.9495887756348
1985	60.356861114502
1986	55.4783210754395
1987	56.3213500976562
1988	58.0662117004395
1991	49.9990386962891
1992	48.8707008361816
1993	58.9384002685547
1994	62.528881072998
1995	67.3050003051758
1996	71.2178726196289
1997	74.8253784179688
1998	77.1307907104492
1999	79.0940170288086
2000	80.7876281738281
2001	82.1533966064453
2002	83.752197265625
2003	86.2471237182617
2004	89.6812591552734
2005	92.7624130249023
2006	97.1489715576172
2007	101.165946960449
2008	104.593849182129
2009	109.032806396484
2010	111.82495880127
2011	113.172569274902
2012	112.417518615723
2013	106.14119720459
2014	104.005027770996
2015	102.483001708984
2016	100.943069458008
2017	99.7379989624023
2018	99.2880020141602
2019	97.9619979858398
2020	103.801002502441
2021	103.032997131348
2022	103.800003051758