Year	Number
1960	41668
1961	41302
1962	40948
1963	40365
1964	39965
1965	39709
1966	38879
1967	37868
1968	37058
1969	36319
1970	35636
1971	35534
1972	35980
1973	36809
1974	37999
1975	39226
1976	40490
1977	41815
1978	43187
1979	44596
1980	46068
1981	47600
1982	49168
1983	50630
1984	51872
1985	53043
1986	54296
1987	54863
1988	51880
1989	48886
1990	49446
1991	50768
1992	51608
1993	51931
1994	53225
1995	54999
1996	56247
1997	57744
1998	58054
1999	58911
2000	61860
2001	64965
2002	68176
2003	71606
2004	75364
2005	79467
2006	83939
2007	88748
2008	93769
2009	98748
2010	104879
2011	111527
2012	117095
2013	121810
2014	122365
2015	121550
2016	120260
2017	116529
2018	115637
2019	119220
2020	123959
2021	127994
2022	132294
2023	137243