Year	% gross
1971	10.4357595443726
1972	10.2547197341919
1974	10.4904003143311
1979	12.6252403259277
1980	16.2487297058105
1984	31.674129486084
1988	19.1064205169678
1989	17.5184993743896
1990	17.2898597717285
2005	20.4441509246826
2006	23.0418605804443
2007	25.4470100402832
2008	27.833890914917
2009	29.114429473877
2011	35.2706108093262
2012	36.8165893554688
2014	37.5564994812012
2015	37.9068908691406
2016	37.8174285888672
2017	36.4246711730957
2018	35.9789199829102
2019	33.9341506958008
2021	35.1450004577637