Year	Number
1970	84429.91
1971	88743.91
1972	94561.7
1973	99637.68
1974	106657.4
1975	112518.7
1976	118113.6
1977	122952.1
1978	125830.8
1979	128792.6
1980	130950.7
1981	131554
1982	134148.5
1983	135154.3
1984	135313.7
1985	133126.5
1986	133154.9
1987	135754.4
1988	136905.4
1989	138313.1
1990	140529.4
1991	152998.1
1992	160141.1
1993	164989.8
1994	169339.3
1995	174105.2
1996	177099.6
1997	184582.7
1998	185224.2
1999	189261.7
2000	185317.8
2001	188696.5
2002	197228.1
2003	201218.5
2004	202983.3
2005	202574.8
2006	209329.1
2007	209913.8
2008	214380.5
2009	222534.1
2010	231773.8
2011	233522.2
2012	232428.5
2013	232111.7
2014	231866.2
2015	232192.7
2016	233637.4
2017	236517.1
2018	240332