Year	Number
1986	4628863
1987	3292669
1988	2196901
1989	1517692
1990	2657819
1991	2201453
1992	2480706
1993	3294787
1994	4338736
1995	5934937
1996	7309188
1997	8526571
1998	6952243
1999	5071870
2000	4725846
2001	4212502
2002	4142607
2003	3922742
2004	4165295
2005	4146726
2006	4699384
2007	3724073
2008	3589561
2009	3238443
2010	3423232
2011	3506037
2012	3123060
2013	3382712
2014	3012927
2015	2864500
2016	2666130
2017	2530310
2018	2546001