Year	% gross
1971	6.77091979980469
1972	6.36908006668091
1973	6.49980020523071
1974	7.14283990859985
1975	8.03649997711182
1976	9.0334997177124
1977	10.5183897018433
1978	11.8944902420044
1979	12.7485399246216
1980	14.0102701187134
1981	15.0849304199219
1982	15.3142099380493
1983	14.88148021698
1984	14.0019397735596
1985	13.3269395828247
1986	13.0928802490234
1987	13.4117603302002
1988	13.8540096282959
1989	14.3045301437378
1990	14.2474098205566
1991	14.5435199737549
1992	13.2547597885132
1993	12.8920001983643
1994	18.6427097320557
1995	19.644510269165
1996	20.1621894836426
1997	22.5634307861328
1998	23.3425903320312
1999	26.4795093536377
2000	30.2823696136475
2001	32.800910949707
2002	38.5895690917969
2003	40.5895385742188
2004	47.5738410949707
2005	52.747428894043
2006	54.833179473877
2007	60.6281700134277
2008	65.9205017089844
2009	71.3405609130859
2010	75.7174911499023
2011	78.233642578125
2012	78.3601303100586
2013	77.8659515380859
2014	78.8316879272461
2015	78.8992462158203
2016	79.1647186279297
2017	79.4584579467773
2018	78.0667419433594
2019	78.2053298950195
2020	78.7804183959961
2021	80.7192001342773