Year	Number
1960	17821
1961	17821
1962	17821
1963	17821
1964	17821
1965	24306
1966	24306
1967	24306
1968	24306
1969	24306
1970	37871
1971	37871
1972	37871
1973	37871
1974	37871
1975	47583
1976	52770
1977	64486
1978	74237
1979	78623
1980	82975
1981	88587
1982	98670
1983	106125
1984	117151
1985	128179
1986	130971
1987	132718
1988	138222
1989	158840
1990	190218
1991	202209
1992	214409
1993	231090
1994	245094
1995	286352
1996	338035
1997	429712
1998	517000
1999	610701
2000	676631
2001	756085
2002	845968
2003	944140
2004	1132121
2005	1248161
2006	1354926
2007	1413695
2008	1448891
2009	1413234
2010	1498604
2011	1626341
2012	1743842
2013	1863052
2014	1718298
2015	1718851
2016	2454778
2017	2461109
2018	2436093
2019	1974006
2020	2272467
2021	2319643
2022	1917670