Year	% gross
1971	10.0386199951172
1972	11.7317304611206
1973	13.3296098709106
1974	15.5876598358154
1975	19.7415790557861
1976	25.4018001556396
1977	31.5872898101807
1978	36.3092308044434
1979	41.415958404541
1980	45.008960723877
1982	42.1747703552246
1983	37.2859115600586
1984	30.9160900115967
1985	26.8313503265381
1986	27.6978206634521
1987	27.1621799468994
1988	30.2823696136475
1989	28.2212295532227
1990	30.8748607635498
1991	29.4305591583252
1992	29.2548599243164
1994	30.7273693084717
1995	33.0590591430664
1996	35.1116485595703
1997	35.3619918823242
1999	42.4738006591797
2000	44.674430847168
2001	48.2255592346191
2002	53.1313209533691
2003	55.4191818237305
2004	56.4087295532227
2005	58.8001403808594
2006	60.5761489868164
2007	56.8467597961426
2017	70.3417434692383
2021	70.3592681884766