Year	Number
1961	1353.1936379702095
1962	1400.5531807895397
1963	1490.0747615364785
1964	1560.7087024491923
1965	1645.724119671697
1966	1741.2398921832885
1967	1843.6984039625756
1968	1929.3855991103696
1969	1997.4722222222222
1970	2082.045518404046
1971	2137.8537405435695
1972	2162.534435261708
1973	2224.366041896362
1974	2268.7465790914066
1975	2306.2618595825425
1976	2362.6522327469556
1977	2419.572857529062
1978	2443.37863042899
1979	2491.377023083046
1980	2521.962739438468
1981	2545.501820072803
1982	2563.641038827462
1983	2572.877059569075
1984	2567.0974155069584
1985	2592.4444444444443
1986	2645.384805741153
1987	2728.8688236769503
1988	2752.362008950771
1989	2755.751346059716
1990	2833.440673767649
1991	2797.5460122699383
1992	2797.3405565131743
1993	2761.6491827274945
1994	2690.8396946564885
1995	2662.2453813358597
1996	2661.1546685673557
1997	2681.107099879663
1998	2680.8613597870794
1999	2683.8772528007794
2000	2681.0176125244616
2001	2662.4328285295555
2002	2654.9106049473426
2003	2649.9877119685425
2004	2642.0664206642064
2005	2634.170359428853
2006	2619.164619164619
2007	2611.903590752582