Year	Number
1960	72158
1961	72815
1962	73708
1963	74766
1964	75859
1965	76932
1966	78005
1967	79090
1968	80207
1969	81419
1970	82706
1971	84022
1972	85390
1973	86841
1974	88378
1975	89977
1976	91182
1977	91795
1978	92058
1979	91933
1980	91393
1981	90440
1982	89080
1983	87388
1984	85477
1985	83416
1986	81223
1987	78908
1988	76777
1989	75429
1990	74775
1991	74428
1992	74428
1993	74749
1994	75252
1995	75581
1996	75956
1997	76650
1998	77475
1999	78438
2000	79486
2001	80104
2002	80890
2003	82113
2004	83254
2005	84626
2006	85929
2007	87372
2008	89325
2009	91639
2010	94109
2011	96241
2012	97931
2013	99568
2014	101341
2015	104745
2016	109934
2017	115395
2018	121007
2019	126912
2020	132447
2021	136381
2022	140101
2023	144953