Year	Number of
1980	71680
1981	71550
1982	41750
1983	52500
1984	18780
1985	10740
1986	14350
1987	18090
1988	16050
1989	14390
1990	4332
1991	23070
1997	1290
1998	3084
1999	3314
2000	7107
2001	10140
2002	13790
2003	13810
2004	18400
2005	21840
2006	25480
2007	28770