Year	Number
1960	37148
1961	37148
1962	37148
1963	37148
1964	37148
1965	54000
1966	54000
1967	54000
1968	54000
1969	54000
1970	95000
1971	95000
1972	95000
1973	95000
1974	95000
1975	219000
1976	237000
1977	261000
1978	296000
1979	332000
1980	366000
1981	382240
1982	434320
1983	463231
1984	519491
1985	626498
1986	798912
1987	901622
1988	1005872
1989	1158014
1990	1324522
1991	1553160
1992	1790029
1993	2214519
1994	2750839
1995	3481997
1996	4160158
1997	4826684
1998	5037549
1999	5215636
2000	5591084
2001	6049129
2002	6557023
2003	6632409
2004	6811615
2005	7034662
2006	7071633
2007	7024049
2008	7394349
2009	7204936
2010	6835146
2011	6661000
2012	6377000
2013	6056000
2014	5690000
2015	5309000
2016	4706000
2017	9955000
2018	6059000
2019	5415000
2020	5003000
2021	4634000
2022	4368000