Year	Number
1961	264.17106422977844
1962	275.6026002872491
1963	283.75497771206807
1964	294.49450527247393
1965	303.13386407571033
1966	332.07055833031256
1967	340.02439064894196
1968	338.4248215593063
1969	339.24557260082037
1970	344.05967873491244
1971	353.5175672946673
1972	357.7388287746356
1973	366.18263412274626
1974	376.25039598678734
1975	392.51403879885873
1976	398.70032224731517
1977	406.1843781981952
1978	409.5929948531906
1979	411.8414983351966
1980	424.28936153683446
1981	424.5710925718313
1982	432.10071769273367
1983	437.23373616504654
1984	440.7450384888659
1985	448.8677531557381
1986	452.4894351260493
1987	462.469489408186
1988	461.17824475756146
1989	462.9426516315323
1990	457.1392388474595
1991	449.9187447720573
1992	412.5944584382872
1993	414.9112298855
1994	416.4907796583971
1995	418.76956707609014
1996	420.6288887022552
1997	421.7525110231411
1998	424.9373139430541
1999	427.7969182557781
2000	427.69677999234807
2001	421.6422817757495
2002	428.53141078219653
2003	386.15518586012973
2004	386.3253100766878
2005	386.91758154836697