Year	% gross
1970	38.6159591674805
1971	38.8901596069336
1972	39.496898651123
1973	40.6049385070801
1974	41.7476501464844
1975	43.5120315551758
1976	45.7895812988281
1977	48.2762985229492
1978	50.7173385620117
1979	52.3090591430664
1980	54.6131706237793
1981	56.486198425293
1982	57.2603492736816
1983	57.6128883361816
1984	57.6925315856934
1985	56.1912002563477
1986	56.0964202880859
1987	55.6502304077148
1988	55.3693885803223
1989	54.4389381408691
1990	53.3013687133789
1991	55.2167816162109
1992	54.4051818847656
1993	54.7442893981934
1994	55.7254219055176
1995	57.1258010864258
1996	57.0433197021484
1997	61.1738204956055
1998	61.8699798583984
1999	62.2944488525391
2000	64.7697906494141
2001	68.0794219970703
2002	73.1623764038086
2003	76.7070617675781
2004	79.4169769287109
2005	83.3801498413086
2006	86.5880279541016
2007	89.1386032104492
2008	93.2881622314453
2009	93.8810882568359
2010	94.0774765014648
2011	94.087516784668
2012	95.1869583129883
2013	95.4376220703125
2014	95.6010513305664
2015	95.39794921875
2016	96.1201477050781
2017	96.5888671875
2018	97.3194198608398
2019	98.4020309448242
2020	99.296501159668
2021	98.7023468017578
2022	98.8052673339844