Year	Number
1973	219406
1978	237458
1980	235419
1981	228858
1982	215991
1983	196391
1984	184780
1985	176842
1986	177956
1987	170568
1988	174597
1993	219712
2000	317053
2001	261892
2002	265019
2003	247640
2004	250180
2005	234382
2006	139262
2007	97403
2008	32707
2009	51908
2010	19247