Year	Number
1970	356565
1971	395575
1972	451042
1973	516658
1977	745717
1978	904931
1979	1131112
1980	1451242
1981	1864713
1982	2345604
1983	2880280
1984	3393186
1985	3561207
1986	2988174
1987	3088711
1989	2956376
1990	3125192
1999	3844585
2000	4104345
2001	4601105
2002	5124270
2004	6279562
2005	6397581
2006	6436449
2007	6068160
2008	6888700
2009	7827318
2010	9056768
2011	9591205
2012	10212250
2013	12532753
2014	10495583
2015	11116030
2016	10314796
2018	11374084
2020	13154092
2021	13947585