Year	Number
1960	23828
1961	24802
1962	25845
1963	27045
1964	28444
1965	30041
1966	31817
1967	33746
1968	35785
1969	37885
1970	39988
1971	41960
1972	43704
1973	45457
1974	47452
1975	49675
1976	52069
1977	54576
1978	57122
1979	59632
1980	62063
1981	64381
1982	66660
1983	69031
1984	71523
1985	74128
1986	76823
1987	79573
1988	82333
1989	85086
1990	87843
1991	90370
1992	92373
1993	94182
1994	96208
1995	98483
1996	101032
1997	103876
1998	106981
1999	110272
2000	113690
2001	117191
2002	120728
2003	124247
2004	127699
2005	131051
2006	134282
2007	137411
2008	140456
2009	143445
2010	146409
2011	149095
2012	151467
2013	153709
2014	155838
2015	157895
2016	159815
2017	161528
2018	163020
2019	164337
2020	165567
2021	166743
2022	167865
2023	168901