Year	Number
1970	16794
1972	19610
1977	16686
1978	23946
1979	29443
1980	34629
1981	41581
1982	81492
1983	89076
1984	108664
1985	98487
1986	105003
1988	134400
1989	136677
1990	141377
1991	141491
1992	147530
1993	151722
1994	152596
1999	129013
2000	132884
2001	140631
2002	162960
2003	180278
2004	154594
2005	159283
2006	202082
2007	213366
2008	308311
2010	390427
2018	776048
2020	861872
2021	912245