Year	% gross
1970	67.9352798461914
1971	68.6895980834961
1972	69.4369125366211
1973	71.2630004882813
1974	73.2702789306641
1975	74.4567794799805
1976	75.6281661987305
1977	76.3258819580078
1978	76.5300064086914
1979	76.7629699707031
1980	77.6104507446289
1981	78.5563278198242
1982	79.7438278198242
1983	81.4244079589844
1984	83.2006912231445
1985	84.4462738037109
1986	85.7857513427734
1987	85.6975326538086
1988	85.3039321899414
1989	85.0096206665039
1990	86.1771621704102
1991	87.6984405517578
1992	88.1841278076172
1993	89.2169494628906
1994	90.2926406860352
1995	89.6493835449219
1996	91.5299377441406
1997	92.9102325439453
1998	93.5517425537109
1999	93.9676132202148
2000	94.7520217895508
2001	95.5571670532227
2002	96.3243789672852
2003	97.3422775268555
2004	97.9931030273438
2005	99.4676895141602
2006	99.5836868286133
2007	99.4654769897461
2008	99.5699081420898
2009	99.5998306274414
2010	99.927131652832
2011	100.171592712402
2012	100.327827453613
2013	100.659629821777
2014	99.9844512939453
2015	100.086219787598
2016	100.435806274414
2017	99.9199829101563
2018	100.120918273926
2019	101.024192810059
2020	101.894538879395