Year	% gross
1971	1.68929994106293
1972	1.7572900056839
1973	1.78135001659393
1974	1.73697996139526
1975	1.75583004951477
1976	1.79603004455566
1977	2.62582993507385
1979	3.65742993354797
1981	4.69641017913818
1982	4.63871002197266
1984	4.80947017669678
1985	4.93875980377197
1986	4.60020017623901
1987	6.46958017349243
1988	5.49718999862671
1989	5.40656995773315
1990	5.28269004821777
1992	4.59406995773315
1993	5.65302991867065
1994	5.39379978179932
1995	5.55975008010864
1998	7.26316976547241
2001	11.6127595901489
2007	10.9157104492188
2011	14.2016801834106
2012	13.6632795333862
2018	20.3939208984375