Year	Number
1960	535202
1961	535202
1962	535202
1963	535202
1964	535202
1965	784000
1966	784000
1967	784000
1968	784000
1969	784000
1970	1070000
1971	1070000
1972	1070000
1973	1070000
1974	1070000
1975	1386000
1976	1568000
1977	1671000
1978	1760000
1979	1852000
1980	1943000
1981	2023000
1982	2108590
1983	2217048
1984	2349218
1985	2487451
1986	2625111
1987	2774410
1988	2952807
1989	3124400
1990	3293000
1991	3565294
1992	3938144
1993	4415800
1994	5006094
1995	5728497
1996	6532394
1997	7510000
1998	8812342
1999	10175196
2000	10945567
2001	11400000
2002	11861266
2003	12292450
2004	12553477
2005	11836243
2006	11475613
2007	10490569
2008	9453928
2009	8493453
2010	7667085
2011	6852599
2012	5950896
2013	8257428
2014	9731940
2015	9053648
2016	8143145
2017	7412432
2018	6575246
2019	6044956
2020	5777428
2021	5311658
2022	5277054