Year	Number
1972	9656342
1973	9216304
1974	9242567
1975	8847498
1976	8128963
1977	7604679
1978	7261453
1979	7019180
1980	5071969
1981	5126207
1982	4654458
1983	5041597
1984	5260653
1985	5149232
1986	4438927
1987	3682594
1988	3142353
1989	2777699
1990	2799398
1991	2595464
1992	2883172
1993	3001819
1994	3091100
1995	2850105
1996	2959077
1997	2697409
1998	2067895
1999	1763598
2000	1827643
2001	1540135
2002	1778612
2003	1826254
2004	1785787
2005	1262411
2006	1268638
2007	1045320
2008	1016963
2009	1280552
2010	1367375
2011	1614727
2012	1397892
2013	1303715
2014	1289053
2015	1126096
2016	797329
2017	863298
2018	1101973