Year	Number
1960	7671
1961	8167
1962	8697
1963	9259
1964	9856
1965	10488
1966	11077
1967	11601
1968	12136
1969	12882
1970	13835
1971	14837
1972	15887
1973	16966
1974	17652
1975	17963
1976	18251
1977	18522
1978	18789
1979	19150
1980	19633
1981	20129
1982	20645
1983	21180
1984	21747
1985	22375
1986	23093
1987	23863
1988	24662
1989	25479
1990	26284
1991	27023
1992	27698
1993	28346
1994	28994
1995	29666
1996	30968
1997	32671
1998	34440
1999	36260
2000	38158
2001	39357
2002	40187
2003	41033
2004	41888
2005	42751
2006	44067
2007	45762
2008	47519
2009	49338
2010	51179
2011	52996
2012	54784
2013	56573
2014	58381
2015	60243
2016	62160
2017	64107
2018	66091
2019	68128
2020	70306
2021	72601
2022	74878
2023	77121