Year	Number
1960	16687
1961	17123
1962	17648
1963	18304
1964	19028
1965	19836
1966	20754
1967	21758
1968	22824
1969	23949
1970	25140
1971	26394
1972	27703
1973	28352
1974	27974
1975	27607
1976	27789
1977	28187
1978	28626
1979	29108
1980	29626
1981	30160
1982	30605
1983	30888
1984	31130
1985	31418
1986	31777
1987	32231
1988	32775
1989	33411
1990	34145
1991	34965
1992	35767
1993	36301
1994	36681
1995	37184
1996	37816
1997	38590
1998	39502
1999	40526
2000	41653
2001	42834
2002	43913
2003	44996
2004	46300
2005	47820
2006	49550
2007	51493
2008	53619
2009	55883
2010	58275
2011	60434
2012	62376
2013	64467
2014	66682
2015	68970
2016	71223
2017	73441
2018	75732
2019	78060
2020	80369
2021	82668
2022	85248
2023	88176