Year	Number
1960	51493
1961	52853
1962	54255
1963	55684
1964	56948
1965	58071
1966	59271
1967	60574
1968	61974
1969	62873
1970	62832
1971	62184
1972	61198
1973	60054
1974	58871
1975	57734
1976	56629
1977	56043
1978	56263
1979	57232
1980	59348
1981	62677
1982	66941
1983	70687
1984	73743
1985	77182
1986	80906
1987	84829
1988	88907
1989	93128
1990	97475
1991	101948
1992	106544
1993	111261
1994	116068
1995	120925
1996	125848
1997	130867
1998	135992
1999	141077
2000	147442
2001	154669
2002	160925
2003	166411
2004	171492
2005	176687
2006	182545
2007	189429
2008	197453
2009	206552
2010	216511
2011	225992
2012	234862
2013	244176
2014	253897
2015	263990
2016	274432
2017	284946
2018	295107
2019	304550
2020	312666
2021	319368
2022	324951
2023	329539