Year	Number
1971	136360
1972	133262
1973	130871
1977	157226
1978	162286
1981	158969
1982	157819
1983	156602
1986	159887
1987	208993
1988	225489
1989	232015
1990	197727
1991	223771
2005	336071
2006	339200
2007	293663
2008	239826
2009	242852
2010	230870
2011	247359
2012	232452