Year	Number
1970	490668
1971	494043
1972	494043
1973	494043
1974	494043
1975	836019
1976	913660
1977	961073
1978	1034473
1979	1108696
1980	1222601
1981	1453338
1982	1609724
1983	1732466
1984	1880367
1985	2029480
1986	2172466
1987	2288311
1988	2410544
1989	2543605
1990	2745516
1991	2891471
1992	3055385
1993	3294447
1994	3586744
1995	4104206
1996	4646519
1997	5156855
1998	5936844
1999	6694873
2000	7499905
2001	8253849
2002	9338966
2003	10507218
2004	11510261.5
2005	12565651
2006	14070832
2007	15846020
2008	17054578
2009	17460768
2010	18474198
2011	18510761
2012	18636286
2013	18021351
2014	17257883
2015	17177092
2016	16659878
2017	15624435
2018	13101619
2019	15904742
2020	15862107
2021	14701368
2022	6958656