Year	% gross
1971	123.34162902832
1972	121.275550842285
1973	113.927757263184
1974	118.939613342285
1981	99.7472686767578
1986	96.3900985717773
1987	96.9792633056641
1988	96.7069091796875
1989	96.2490997314453
1990	95.5180511474609
1991	91.7303085327148
1992	92.3837738037109
1993	92.9927291870117
1994	93.4075698852539
1995	96.5948181152344
1996	99.0923309326172
1997	99.3086013793945
1998	102.26602935791
1999	103.355140686035
2000	104.286956787109
2001	105.790283203125
2002	105.530220031738
2003	102.830619812012
2004	105.122337341309
2005	102.187843322754
2006	101.634002685547
2007	100.085487365723
2008	98.5809478759766
2009	100.860786437988
2010	99.9739990234375
2011	98.3790512084961
2012	96.2415466308594
2015	88.8662567138672
2016	87.5895919799805
2017	87.2723999023438
2018	91.3751220703125
2019	92.5572204589844
2020	92.4761123657227
2021	90.7731704711914