Year	% gross
1977	2.63288998603821
1978	2.4883599281311
1979	2.73503994941711
1980	2.57068991661072
1981	2.32316994667053
1982	3.19303011894226
1983	2.73659992218018
1984	2.77310991287231
1985	2.18654990196228
1987	2.79391002655029
1988	2.95388007164001
1993	7.17288017272949
1996	25.6535701751709
2004	21.7051391601562
2005	20.076789855957
2006	17.4017391204834
2007	13.0708904266357
2008	23.4228401184082
2009	26.4886798858643
2010	18.6113300323486
2011	21.3051795959473
2012	14.4597997665405
2013	19.1007099151611
2014	23.5366802215576
2015	22.7000694274902
2016	26.6294002532959
2017	28.0642700195312
2018	19.7136402130127
2019	21.975170135498
2020	23.0109596252441
2022	22.5474090576172