Year	Number
1961	229.48124210611599
1962	239.38780355729435
1963	246.71979327273755
1964	256.31330901208173
1965	264.4977542006576
1966	289.35242055475726
1967	297.0897294805739
1968	297.57479493159616
1969	298.95374354087716
1970	305.1245437212934
1971	313.614759652266
1972	318.46754872632545
1973	326.9590225714023
1974	338.2100141386966
1975	352.9267151488879
1976	360.5303982023979
1977	368.6372913604854
1978	374.52872820677675
1979	378.67387162927963
1980	392.0533824853742
1981	395.26112113680307
1982	405.023002176328
1983	411.5824145563923
1984	416.34147616630366
1985	427.2041411414485
1986	434.00000926124346
1987	443.9895857650743
1988	445.30411486218804
1989	448.12329878192526
1990	444.65285607559986
1991	438.9517098152776
1992	436.4409064468126
1993	437.7723191020088
1994	443.96713527358935
1995	449.19985872439906
1996	452.8873906397734
1997	457.05331247594864
1998	462.87505508797955
1999	467.1042250507151
2000	468.425579995554
2001	461.9127448324115
2002	471.047008957482
2003	434.1280974482571
2004	435.30979139252736
2005	439.262960101131