Year	Number
1971	135179
1972	149303
1973	169635
1974	191704
1984	583783
1986	666169
1987	752346
1988	852250
1989	882119
1991	866016
1992	782412
1993	720825
1994	723009
1995	756249
1996	819242
1999	1059753
2000	1194701
2001	1495445
2002	1734131
2003	1857817
2004	2140751
2005	2488465
2006	2992589
2007	3430129
2008	3696385
2009	3882551
2010	4206700
2011	4541623
2012	4928710
2013	4566854
2014	4783709
2015	5028678