Year	Number
1960	180030
1961	180030
1962	180030
1963	180030
1964	180030
1965	243361
1966	243361
1967	243361
1968	243361
1969	243361
1970	376987
1971	376987
1972	376987
1973	376987
1974	376987
1975	680585
1976	769907
1977	851353
1978	986844
1979	1092137
1980	1147782
1981	1301558
1982	1501977
1983	1673227
1984	1941088
1985	2247884
1986	2779615
1987	3696872
1988	4910911
1989	5861517
1990	6861458
1991	8151740
1992	9410486
1993	10935523
1994	12212000
1995	13127000
1996	14286478
1997	15579000
1998	16807000
1999	17912000
2000	18395171
2001	18904486
2002	18890000
2003	18916721
2004	19125163
2005	18978223
2006	18831616
2007	18201006
2008	17502205
2009	16534356
2010	16201466
2011	15210846
2012	13859672
2013	13551705
2014	12528865
2015	11493057
2016	11077559
2017	11308444
2018	11633461
2019	11532903
2020	12448604
2021	12310016
2022	11197979