Year	Number
1961	841.1489361702128
1962	902.0114895363153
1963	957.1656391286477
1964	1007.0002466902392
1965	1060.1267176828767
1966	1108.5619086795557
1967	1158.2745456054445
1968	1194.5287566489362
1969	1237.912673943838
1970	1259.1741967871487
1971	1289.4141245298788
1972	1295.5073308897036
1973	1302.2093411175981
1974	1303.4034941763728
1975	1310.1752346150652
1976	1306.772565566311
1977	1317.294341810952
1978	1321.2932318384908
1979	1333.9072737828649
1980	1341.2319201995012
1981	1345.2882372542485
1982	1354.0901878914403
1983	1366.9357399515334
1984	1370.9638554216867
1985	1372.9405369239776
1986	1375.0284280936455
1987	1368.3281707827543
1988	1353.3495145631068
1989	1334.7250815967864
1990	1309.4144181772617
1991	1297.6901116013496
1992	1152.7862562134821
1993	1113.3949982870845
1994	1068.5302837780603
1995	1027.2074355724546
1996	1005.4921841994085
1997	943.2243069641651
1998	902.6104890984091
1999	871.912535949924
2000	838.2645713317519