Year	Number
1961	43.75046165209898
1962	56.91887579774178
1963	70.6016661524221
1964	81.74634085055594
1965	92.62432669422523
1966	109.08956090012252
1967	114.8138500635324
1968	130.23005353046136
1969	148.95162293247108
1970	165.5952836201402
1971	172.82024603708916
1972	187.98440569744596
1973	205.84215771770275
1974	223.36600075386355
1975	239.59926679729472
1976	256.06948968512484
1977	269.6052463211772
1978	291.35230179028133
1979	315.5700346642701
1980	336.74444015940355
1981	352.03288586293274
1982	366.9604882749759
1983	379.68830169317596
1984	390.66705002875216
1985	406.84271395528145
1986	422.6315451333119
1987	435.49794661190964
1988	450.618219169288
1989	465.8722279525529
1990	483.09748940332577
1991	495.30934591689606
1992	504.0898625090454
1993	517.4856494460018
1994	533.3965959746049
1995	573.5799216803133
1996	569.9716262975778
1997	589.3818690934546
1998	630.0350774627302
1999	655.111787863032
2000	671.4179104477612
2001	708.5793018983466
2002	732.8631187543574
2003	724.9389260198202
2004	742.1097888675623
2005	759.5508402385193
2006	786.3380503144654
2007	807.2803114571747
2008	825.1441383728379
2009	831.1802832679844