Year	Number
1970	494391.9
1971	504278.3
1972	532911.9
1973	553994.2
1974	633755.1
1975	619793.9
1976	678515.6
1977	750257.6
1978	807488.7
1979	906089.1
1980	982154.9
1981	1090354
1982	1208929
1983	1296344
1984	1358990
1985	1456507
1986	1634902
1987	1750769
1988	1795497
1989	1835104
1990	1836707
1991	1875159
1992	1844952
1993	2216216
1994	2521051
1995	2560598
1996	2604800
1997	2805491
1998	3015527
1999	3167761
2000	3316648
2001	3486271
2002	3532964
2003	3614967
2004	3755504
2005	3527295
2006	3299688
2007	2919364
2008	2817137
2009	2609847
2010	2659339
2011	2934621
2012	3053999
2013	3066779
2014	2940432
2015	3022303
2016	3111028
2017	3229905
2018	3326311