Year	% gross
1971	0.988309979438782
1972	0.994499981403351
1973	1.1581699848175
1974	1.1894199848175
1976	1.26135003566742
1977	1.35430002212524
1978	1.45732998847961
1979	1.68413996696472
1980	1.87885999679565
1981	2.5046501159668
1982	2.35791993141174
1984	2.33618998527527
1985	2.42587995529175
1987	2.91321992874146
1992	2.56648993492126
1993	3.05497002601624
1994	3.81440997123718
1995	3.79641008377075
1997	5.73650979995728
1999	5.79388999938965
2007	8.78141975402832
2008	8.34580993652344
2009	8.18346977233887
2010	7.47382020950317
2011	3.30475997924805
2013	8.12195014953613
2014	8.36830043792725
2015	8.89927959442139
2016	9.09276962280273
2017	9.47000026702881
2019	9.91261005401611
2020	9.77698040008545