Year	Number of
1953	197300
1954	199400
1955	204700
1956	211100
1957	218700
1958	227200
1959	235200
1960	240900
1961	243700
1962	245200
1963	245800
1964	247400
1965	250700
1966	257000
1967	265200
1968	273900
1969	281100
1970	284500
1971	284600
1972	280900
1973	276500
1974	274700
1975	277100
1976	282700
1977	291000
1978	300900
1979	308900
1980	311900
1981	308100
1982	300600
1983	291000
1984	281200
1985	272200
1986	263900
1987	256700
1988	250000
1989	242500
1990	233900
1991	224200
1992	214500
1993	204600
1994	194800
1995	186300
1996	178300
1997	171900
1998	166000
1999	160200
2000	154400
2001	148300
2002	142700
2003	136700
2004	130200
2005	123800
2006	117100
2007	109800
2008	103000
2009	96820
2010	91440
2011	86840
2012	82870
2013	79860
2014	77110
2015	74380