Year	Number
1960	150000
1961	150000
1962	170000
1963	175000
1964	200000
1965	220000
1966	303800
1967	356200
1968	381360
1969	408190
1970	414120
1971	419690
1972	421500
1973	426550
1974	497390
1975	501830
1976	499190
1977	529830
1978	646110
1979	652980
1980	449030
1981	457060
1982	465890
1983	298110
1984	357821
1985	317392
1986	355412
1987	391733
1988	407566
1989	408692
1990	407760
1991	381638
1992	300494
1993	323822
1994	282570
1995	246653
1996	249686
1997	267687
1998	319420
1999	353472
2000	433756
2001	470616
2002	435415
2003	329573
2004	228842
2005	215811
2006	206482
2007	186137
2008	171374
2009	141006
2010	134851
2011	128657
2012	19253
2013	10274
2014	9468
2015	11855
2016	8388
2017	8292
2018	8243
2019	8176
2020	8196
2021	11403
2022	12021
2023	11506