Year	% gross
1970	50.1232490539551
1971	49.6720886230469
1972	52.4837913513184
1973	55.5307006835938
1974	56.167610168457
1975	58.723201751709
1976	61.0689086914062
1977	62.5137596130371
1978	64.1484603881836
1979	65.3953018188477
1980	66.9348602294922
1981	68.3267135620117
1982	68.6990814208984
1983	69.2014083862305
1984	68.8191223144531
1985	66.9807510375977
1986	66.8560791015625
1987	65.9027481079102
1988	68.143440246582
1989	67.6023864746094
1990	66.4713668823242
1991	68.3087768554688
1992	68.3132400512695
1993	68.8255920410156
1994	69.6997222900391
1995	71.2794036865234
1996	71.8169708251953
1997	74.7973022460938
1998	75.3050231933594
1999	75.0055618286133
2000	77.1923599243164
2001	79.6674423217773
2002	84.6112289428711
2003	88.0299224853516
2004	90.7664566040039
2005	93.3724136352539
2006	95.834602355957
2007	97.5209426879883
2008	100.095916748047
2009	100.706382751465
2010	100.844581604004
2011	101.329849243164
2012	101.820121765137
2013	101.91552734375
2014	101.84538269043
2015	101.072929382324
2016	101.59619140625
2017	102.292022705078
2018	103.407943725586
2019	104.374557495117
2020	104.958686828613
2021	104.124267578125
2022	103.995956420898