Year	Number
1970	103152
1971	116640
1972	130434
1973	136142
1976	144351
1977	177221
1978	251362
1979	291457
1980	301427
1981	343551
1982	369636
1983	386826
1984	383989
1985	359701
1986	308072
1987	292821
1988	308182
1989	344221
1990	331915
1991	353600
1992	384212
1993	428097
1994	435210
1995	423059
1996	416745
1999	432096
2000	446405
2001	488164
2002	491751
2003	590655
2004	597532
2005	599172
2006	565646
2007	466784
2010	574078
2015	523429
2016	453248
2017	480112
2018	913579
2019	1001336
2020	823581
2021	913305