Year	Number
1971	97677
1973	104439
1980	107727
1982	118683
1983	121442
1984	128432
1985	123007
1986	129943
1987	126817
1988	129205
1989	136094
1990	126368
1991	116860
1992	106909
1993	104609
1994	102265
1995	112128
1999	81660
2000	71684
2001	57381
2002	29173
2004	17876
2005	14484
2006	28961
2007	30964
2008	27179
2010	31821