Year	Number of
1963	70580
1964	73860
1965	77590
1966	80820
1967	83660
1968	86170
1969	88500
1970	90560
1971	93250
1972	95660
1973	97390
1974	97430
1975	95240
1976	90630
1977	84870
1978	78570
1979	72620
1980	68230
1981	65580
1982	63930
1983	63080
1984	62290
1985	61400
1986	60040
1987	58200
1988	55900
1989	53480
1990	50980
1991	48090
1992	45380
1993	42630
1994	40140
1995	37920
1996	35310
1997	32700
1998	30050
1999	27550
2000	25190
2001	23030
2002	21060
2003	19580
2004	18880
2005	18490
2006	17650
2007	16170
2008	15450
2009	16170
2010	18090
2011	19330
2012	19170
2013	18280
2014	17590
2015	16600