Year	Total
1971	5761
1972	7223
1973	6965
1974	8255
1975	6449
1976	11090
1977	11950
1978	13160
1979	14620
1980	17450
1981	20890
1982	27430
1983	30610
1984	32850
1985	36720
1986	46430
1987	47980
1988	48320
1989	61480
1990	75410
1991	77390
1992	72140
1993	74890
1994	79880
1995	99660
1996	101500
1997	91320
1998	97250
1999	121300
2000	140300
2001	159000
2002	182200
2003	194600
2004	206700
2005	216400
2006	235200
2007	239300
2008	241000
2009	266700
2010	275500