Year	Number
1971	13514
1972	15196
1973	17200
1974	18646
1975	20851
1976	24469
1977	26152
1978	28816
1979	29079
1980	30687
1981	33322
1982	37854
1983	42347
1984	46622
1985	48178
1986	50922
1987	56684
1988	58400
1989	65993
1990	65450
1991	68370
1992	68399
1993	69743
1994	75736
1995	83113
1996	89189
1997	92775
1998	109487
2000	86833
2008	214811
2009	234215
2010	252232
2011	259636
2020	537596
2021	516403
2022	353124