Year	% gross
1970	39.6267585754395
1971	36.7406005859375
1972	37.6752090454102
1973	38.1295585632324
1974	38.6939010620117
1975	39.0685806274414
1976	39.3462791442871
1977	39.9431114196777
1978	39.9223594665527
1979	39.9676208496094
1980	39.562931060791
1981	40.1641502380371
1982	40.897159576416
1983	41.9074401855469
1984	42.655590057373
1985	42.8562393188477
1986	42.7659797668457
1987	42.2655715942383
1988	42.0948104858398
1989	42.2287216186523
1990	43.391731262207
1991	44.3077201843262
1992	44.853889465332
1993	45.910041809082
1994	46.2998390197754
1995	47.9596290588379
1996	48.3594589233398
1997	49.7300682067871
1998	51.045051574707
1999	51.1330413818359
2000	53.0440406799316
2001	54.0914497375488
2002	55.1833801269531
2003	56.2474899291992
2004	58.1202011108398
2005	59.0568809509277
2006	59.6221885681152
2007	60.929859161377
2008	61.1462287902832
2009	62.333381652832
2010	63.3754692077637
2011	63.9231300354004
2012	64.9887313842773
2013	65.8096618652344
2014	66.6457824707031
2015	67.1601181030273
2016	67.6094970703125
2017	68.3955535888672
2018	69.0840835571289
2019	69.6758499145508
2020	69.862663269043
2021	70.0790023803711
2022	70.1384582519531