Year	Number
1961	100.63162184189079
1962	105.7178631051753
1963	111.03507271171942
1964	116.57167908811925
1965	122.44714349977508
1966	128.60572483841182
1967	135.16483516483518
1968	143.66336633663366
1969	151.3360739979445
1970	163.95232815964522
1971	169.5578231292517
1972	175.507835171213
1973	181.53206650831356
1974	187.95620437956205
1975	194.70074812967582
1976	201.79028132992326
1977	209.25196850393698
1978	217.11590296495956
1979	225.57172557172555
1980	234.3406985032074
1981	239.07714491708725
1982	244.16058394160584
1983	249.26144756277697
1984	254.11061285500747
1985	261.7246596066566
1986	269.6788990825688
1987	268.78388845855926
1988	267.45098039215685
1989	266.5075576770088
1990	264.33521353746977
1991	261.5629984051037
1992	260.45777426992896
1993	257.8125
1994	255.22041763341065
1995	252.67993874425727
1996	250.18953752843066
1997	254.05851462865718
1998	257.8470675575353
1999	261.56502571638504
2000	265.5863073561544
2001	264.81481481481484
2002	264.04779145546706
2003	263.2851985559567
2004	262.5269978401728
2005	261.96120689655174
2006	261.2106017191977
2007	247.0528455284553
2008	199.6987951807229