Year	Number
1960	35676
1961	35813
1962	35942
1963	36035
1964	36057
1965	36004
1966	35874
1967	35651
1968	35379
1969	35181
1970	35092
1971	35111
1972	35263
1973	35475
1974	35699
1975	35958
1976	36271
1977	36645
1978	37093
1979	37648
1980	38343
1981	39169
1982	40112
1983	41247
1984	42667
1985	44359
1986	46333
1987	48597
1988	51094
1989	53724
1990	56442
1991	59266
1992	62199
1993	65242
1994	68371
1995	71632
1996	75050
1997	78572
1998	82140
1999	85764
2000	89474
2001	93405
2002	97207
2003	100560
2004	104223
2005	108293
2006	111624
2007	115869
2008	120534
2009	123987
2010	126808
2011	128495
2012	129641
2013	131192
2014	133561
2015	136717
2016	139689
2017	141893
2018	143105
2019	144008
2020	145151
2021	146361
2022	148643
2023	153114