Year	% gross
1970	24.0705699920654
1971	25.4533596038818
1972	26.9626903533936
1973	29.4850807189941
1974	32.0393981933594
1975	36.4192695617676
1976	38.733341217041
1977	40.1003913879395
1981	43.3481292724609
1982	45.1455612182617
1983	46.1639213562012
1984	48.9503517150879
1985	51.9305686950684
1986	53.9278602600098
1987	57.5299682617188
1988	61.9407806396484
1996	53.4962997436523
1997	54.162899017334
1998	55.476619720459
1999	56.2061500549316
2000	59.2625885009766
2001	60.0664710998535
2002	60.7318115234375
2003	60.9645385742188
2004	62.7236518859863
2005	64.3349533081055
2006	64.1637268066406
2007	65.2349472045898
2008	67.2965621948242
2009	68.6873931884766
2010	69.4229431152344
2011	69.4313125610352
2012	71.2427062988281
2013	72.8458099365234
2014	73.8574829101563
2015	75.2564010620117
2016	75.9007415771484
2017	76.6315307617188
2018	77.8188934326172
2019	78.3557891845703
2020	76.7102203369141