Year	Number
1961	85.03465537158259
1962	95.15408320493066
1963	105.665062560154
1964	115.04124304623058
1965	121.44960795563205
1966	127.83732057416269
1967	128.1994247363375
1968	127.62051085077779
1969	128.08846153846153
1970	130.84151742730597
1971	129.31520061728395
1972	125.29457214603053
1973	122.73377125193198
1974	121.58510430883214
1975	121.17394695787831
1976	119.42638997650744
1977	117.86827055807534
1978	114.8969480776853
1979	113.27575938058368
1980	110.30833499104833
1981	109.14728682170542
1982	110.2510460251046
1983	110.77888446215138
1984	110.23274318679132
1985	109.84312946783162
1986	106.97402339877058
1987	105.99643423137877
1988	104.48514851485149
1989	99.73871733966746
1990	97.74436090225564
1991	181.78995253164555
1992	194.0109658371995
1993	193.97641112047177
1994	194.04085070541166
1995	191.8435289221806
1996	191.67532737476617
1997	191.39004149377595
1998	191.47125959742687
1999	191.6926272066459
2000	246.21034332898742
2001	249.1098567086409
2002	252.22535822839777
2003	255.84076571677178
2004	258.90387124836883
2005	261.84959791349706