Year	% gross
1971	16.7306499481201
1972	16.6848602294922
1974	17.5020008087158
1975	18.9533996582031
1976	21.7076206207275
1977	22.8949508666992
1978	24.4629306793213
1979	26.4318008422852
1980	28.0728092193604
1981	29.8828506469727
1982	32.1748390197754
1983	33.8717384338379
1984	35.4501914978027
1985	37.4617881774902
1986	40.7667083740234
1987	42.6596298217773
1988	44.7229614257812
1989	44.0046081542969
1990	42.8664703369141
1991	40.7682189941406
1992	41.7636795043945
1993	42.1582412719727
1994	43.3496513366699
1995	43.3643989562988
1996	43.5400505065918
1997	43.4283103942871
1998	41.6292610168457
1999	41.7962799072266
2000	43.5342597961426
2001	45.3798484802246
2002	47.3628082275391
2003	48.8038215637207
2004	51.609058380127
2005	52.9563217163086
2006	55.8736686706543
2007	59.0197296142578
2008	61.6105690002441
2009	64.9743118286133
2010	67.4351272583008
2011	71.0018463134766
2012	74.2733764648438
2017	82.9574890136719
2018	82.6942596435547
2019	83.3359909057617
2020	83.9117126464844
2021	83.9553604125977
2022	87.7141494750977