Year	Number
1961	235.37735849056602
1962	275.24271844660194
1963	290.625
1964	316.45962732919253
1965	335.5769230769231
1966	354.9689440993789
1967	383.74613003095976
1968	427.48447204968943
1969	483.0218068535825
1970	503.3846153846154
1971	490.9509202453988
1972	512.4615384615385
1973	533.8323353293413
1974	576.2536873156341
1975	572.9166666666667
1976	649.2307692307693
1977	703.0769230769231
1978	747.6923076923077
1979	787.6923076923077
1980	824.6153846153845
1981	815.3846153846154
1982	824.6153846153845
1983	872.2222222222222
1984	819.2073170731707
1985	802.874617737003
1986	835.7396449704142
1987	845.4867256637168
1988	839.0560471976402
1989	840.2366863905324
1990	798.8338192419825
1991	746.9740634005764
1992	743.2276657060519
1993	734.8703170028818
1994	724.9283667621777
1995	721.7391304347826
1996	732.7380952380953
1997	724.5535714285714
1998	718.3582089552239
1999	714.2642642642643
2000	695.2662721893491
2001	679.2397660818714
2002	657.5931232091691
2003	678.7425149700598
2004	720.096463022508
2005	711.0932475884244
2006	721.1221122112211
2007	705.0359712230215
2008	710.0433767100434