Year	Number of
1980	45700
1981	49450
1982	48550
1983	65410
1984	69240
1985	77610
1986	52150
1987	51840
1988	50020
1989	44550
1990	46510
1991	43860
1992	47700
1993	49670
1994	47770
1995	45430
1996	39870
1997	30260
1998	15850
1999	29410
2000	34190
2001	49660
2002	49580
2003	54500
2004	55310
2005	57900
2006	56230
2007	54790