Year	Number
1960	1200000
1961	1200000
1962	1200000
1963	1200000
1964	1200000
1965	1600000
1966	1600000
1967	1600000
1968	1600000
1969	1600000
1970	2100000
1971	2100000
1972	2100000
1973	2100000
1974	2100000
1975	2800000
1976	3000000
1977	3200000
1978	3400000
1979	3600000
1980	3800000
1981	4000000
1982	4300000
1983	4609900
1984	4900000
1985	5200000
1986	5500000
1987	5800000
1988	6233000
1989	6684200
1990	7028300
1991	7344100
1992	7577900
1993	7820400
1994	8066000
1995	8311000
1996	9241000
1997	9410000
1998	9698200
1999	10074000
2000	10417000
2001	10669600
2002	10833300
2003	11109500
2004	12141956
2005	11666600
2006	12397133
2007	12905864
2008	13176871
2009	13026293
2010	12941346
2011	12680881
2012	12182142
2013	11830969
2014	10461083
2015	9113061
2016	8451229
2017	7186579
2018	6074255
2019	4182994
2020	3314263
2021	2282786
2022	1739319