Year	Number
1961	80.9949892627058
1962	85.67935731749913
1963	93.22865554465162
1964	111.62945684771744
1965	131.45436308926782
1966	149.4958263772955
1967	168.40066225165563
1968	171.30691123485096
1969	188.929400066291
1970	205.79734219269105
1971	225.7973921765296
1972	236.3149078726968
1973	263.1112614135949
1974	285.084803256445
1975	321.26547455295736
1976	355.45706371191136
1977	392.78242677824267
1978	418.2962709544988
1979	450.66575623079547
1980	483.3103685842232
1981	520.5264957264958
1982	544.7950819672132
1983	581.7758620689655
1984	612.1047227926078
1985	634.636678200692
1986	671.264327891629
1987	707.8780487804878
1988	724.9982535801607
1989	731.596958174905
1990	744.2393928941013
1991	780.3208929194279
1992	796.2674581005587
1993	814.2902430433251
1994	828.0818053596615
1995	837.2811059907834
1996	854.5373665480428
1997	869.2936536392972
1998	871.6882183908046
1999	904.4858797972485
2000	925.8847136081721
2001	935.7610294117646
2002	945.3735737946264
2003	950.3576696165192
2004	983.1723088626853
2005	984.334975369458
2006	1004.6942724458205