Year	Annual Number
1970	35
1971	0
1972	100100
1973	150200
1974	0
1975	0
1976	0
1977	0
1978	7006
1979	60000
1980	100100
1981	0
1982	5225
1983	0
1984	20000
1985	0
1986	20
1987	228
1988	0
1989	40
1990	17940
1991	44020
1992	0
1993	261400
1994	0
1995	0
1996	9000
1997	0
1998	30430
1999	619000
2000	2139
2001	21
2002	7037
2003	53860
2004	4128
2005	14040
2006	0
2007	1655000
2008	20010