Year	Number
1970	382072.3
1971	393052.9
1972	428324.3
1973	457619.1
1974	484923.2
1975	548393.8
1976	587577.3
1977	632770.6
1978	676057.8
1979	728177.5
1980	788553.9
1981	820888
1982	864624.8
1983	935444
1984	997011.6
1985	1076674
1986	1114835
1987	1169440
1988	1248901
1989	1236824
1990	1274542
1991	1299760
1992	1326267
1993	1404858
1994	1477431
1995	1562207
1996	1564963
1997	1624219
1998	1598617
1999	1577888
2000	1627381
2001	1676184
2002	1723984
2003	1776946
2004	1852576
2005	1929395
2006	2007984
2007	2140062
2008	2365975
2009	2553090
2010	2760724
2011	2815013
2012	2926826
2013	2923636
2014	3067107
2015	3267937
2016	3346537
2017	3383277
2018	3603713