Year	Number
1972	5580947
1973	5316229
1974	5301368
1975	5225729
1976	4898002
1977	4584122
1978	4465982
1979	4040349
1980	3118509
1981	3025591
1982	2652830
1983	2749113
1984	2650276
1985	2638859
1986	2294479
1987	1948486
1988	1730387
1989	1767830
1990	1620397
1991	1682090
1992	1833365
1993	2002701
1994	2149588
1995	2100145
1996	2141026
1997	2268561
1998	1543892
1999	1139555
2000	1150691
2001	984705
2002	1211204
2003	1143992
2004	1062026
2005	787432
2006	703123
2007	595194
2008	603788
2009	711874
2010	812700
2011	922243
2012	933791
2013	855855
2014	728336
2015	692926
2016	537372
2017	510292
2018	703321