Year	Number
1960	40881
1961	41395
1962	41831
1963	42314
1964	42787
1965	43205
1966	43587
1967	43966
1968	44337
1969	44635
1970	44910
1971	45185
1972	45478
1973	45787
1974	46099
1975	46254
1976	46325
1977	46858
1978	47395
1979	47920
1980	48648
1981	49190
1982	49603
1983	49992
1984	50321
1985	50522
1986	50747
1987	51031
1988	51623
1989	53671
1990	55993
1991	57633
1992	59213
1993	60539
1994	61624
1995	63122
1996	64670
1997	66112
1998	67666
1999	68729
2000	69144
2001	68918
2002	68152
2003	67290
2004	66175
2005	64725
2006	63587
2007	62073
2008	60600
2009	59409
2010	58432
2011	57653
2012	56423
2013	54991
2014	53688
2015	52865
2016	52599
2017	52346
2018	51656
2019	50435
2020	49846
2021	49295
2022	48729