Year	Number
1970	145095
1971	158035
1972	181022
1973	190652
1974	210840
1975	228486
1980	292027
1981	299334
1983	337786
1984	357557
1986	370057
1987	388086
1989	376188
1990	400346
1998	704160
1999	780975
2000	338922
2001	359460
2002	380332
2003	394929
2004	408207
2005	413411
2006	412534
2007	414841
2008	422199
2009	420811
2010	435119
2011	431731
2012	445729
2013	462713
2014	465150
2015	452589
2016	443481
2017	437060
2018	445168