Year	Number
1972	36933
1973	29281
1974	22864
1980	9127
1981	10369
1982	12281
1983	18741
1984	22516
1985	21573
1999	36793
2000	38151
2002	43355
2003	44809
2004	46245
2005	51044
2006	51576
2007	87880
2008	82479
2010	74963
2011	71823
2012	73015
2013	50862