Year	Number
1971	10717
1972	11179
1973	12132
1974	14416
1975	15470
1976	16227
1977	18081
1978	19319
1979	21018
1980	25113
1981	27539
1982	31398
1983	32605
1984	35966
1985	43843
1986	53565
1987	62582
1988	72207
1989	84511
1990	91022
1991	98929
1992	105542
1993	115753
1994	125191
1999	173205
2000	189689
2001	199278
2003	236914
2004	266538
2005	295412
2006	319749
2007	352376
2008	423543
2009	467658
2010	537988
2011	604168
2012	676337
2013	762445
2014	841886
2015	965550
2016	1058163
2017	1162297
2018	1281007
2019	1342143
2020	1361214
2021	1370452
2022	1250222