Year	Number
1961	87.53799392097264
1962	110.09174311926606
1963	122.76923076923076
1964	141.60990712074303
1965	146.52173913043478
1966	176.5
1967	154.68553459119497
1968	180.34810126582278
1969	197.22929936305732
1970	197.5079872204473
1971	259.0353697749196
1972	284.8220064724919
1973	298.89250814332246
1974	429.7169811320755
1975	777.0618556701031
1976	787.719298245614
1977	795.9821428571429
1978	861.4545454545455
1979	929.2592592592592
1980	988.5261194029852
1981	1010.6884057971014
1982	1019.0434782608696
1983	1058.5344827586207
1984	1116.5217391304348
1985	1176.9455252918287
1986	1219.7674418604652
1987	1266.9245647969053
1988	1315.2804642166345
1989	1350.5747126436781
1990	1382.5757575757575
1991	1412.4293785310736
1992	1431.2267657992566
1993	1462.7414903403865
1994	1659.9597585513077
1995	1675.0756811301717
1996	1696.969696969697
1997	1722.7319062181448
1998	1601.998001998002
1999	1500.6923837784373
2000	1454.1666666666665
2001	1371.938775510204
2002	1258.1
2003	1046.1607142857142