Year	% gross
1971	2.87565994262695
1972	3.83064007759094
1973	4.10249996185303
1974	4.82980012893677
1975	5.93670988082886
1976	7.89493989944458
1977	9.32252025604248
1978	10.8528604507446
1979	12.9182395935059
1980	14.311900138855
1982	14.2994298934937
1983	12.4242897033691
1984	10.0722799301147
1985	8.48033046722412
1986	8.60258960723877
1987	8.37730026245117
1988	9.89422035217285
1989	8.85865020751953
1990	10.5899801254272
1991	9.99069023132324
1992	9.6207103729248
1994	10.60023021698
1995	11.762809753418
1996	12.4848403930664
1997	12.9726896286011
1999	17.1802196502686
2000	20.1702003479004
2001	22.3457908630371
2002	25.6552906036377
2003	27.6315898895264
2004	29.4462699890137
2005	31.639669418335
2006	33.5170288085938
2007	30.4805793762207
2017	51.9389801025391
2021	58.0838012695312