Year	% gross
1970	17.0516605377197
1971	17.2869091033936
1972	17.2844295501709
1973	18.619010925293
1974	19.4568405151367
1975	19.8996391296387
1976	20.9973907470703
1977	23.0403003692627
1978	24.5537300109863
1979	26.083610534668
1980	27.5217094421387
1981	28.7050495147705
1982	29.9739894866943
1983	31.4878902435303
1984	32.4562797546387
1985	32.0801582336426
1986	31.5884799957275
1987	31.0816802978516
1988	31.2702407836914
1989	31.3222808837891
1990	32.411979675293
1991	32.7748413085938
1992	35.3939018249512
1993	39.4299812316895
1994	41.3725204467773
1995	44.3042984008789
1996	46.9069290161133
1997	50.4885215759277
1998	54.7281684875488
1999	61.4332618713379
2000	64.6615600585938
2001	68.4785614013672
2002	70.1372222900391
2003	67.7881088256836
2004	69.1493301391602
2005	69.0906524658203
2006	68.7788619995117
2007	69.0033798217773
2008	70.4103469848633
2009	71.3650970458984
2010	73.0419769287109
2011	75.6274108886719
2012	82.5331420898438
2013	75.3809967041016
2016	82.3605499267578
2019	75.8560028076172
2020	84.7876205444336
2021	84.2880096435547
2022	82.0107879638672
2023	75.7210006713867