Date Value Value
Dec 31, 2012 58.95 million
Dec 31, 2011 58.66 million
Dec 31, 2010 58.41 million
Dec 31, 2009 59.12 million
Dec 31, 2008 58.37 million
Dec 31, 2007 58.95 million
Dec 31, 2006 58.18 million
Dec 31, 2005 57.98 million
Dec 31, 2004 57.72 million
Dec 31, 2003 57.32 million
Dec 31, 2002 56.75 million
Dec 31, 2001 56.59 million
Dec 31, 2000 55.31 million
Dec 31, 1999 54.77 million
Dec 31, 1998 54.32 million
Dec 31, 1997 53.60 million
Dec 31, 1996 53.57 million
Dec 31, 1995 53.86 million
Dec 31, 1994 53.17 million
Dec 31, 1993 53.09 million
Dec 31, 1992 52.46 million
Dec 31, 1991 52.15 million
Dec 31, 1990 52.32 million
Dec 31, 1989 52.10 million
Dec 31, 1988 51.68 million
Dec 31, 1987 51.54 million
Dec 31, 1986 50.93 million
Dec 31, 1985 50.35 million
Dec 31, 1984 50.08 million
Dec 31, 1983 49.91 million
Dec 31, 1982 49.63 million
Dec 31, 1981 49.29 million
Dec 31, 1980 49.11 million
Dec 31, 1979 47.66 million
Dec 31, 1978 47.36 million
Dec 31, 1977 47.47 million
Dec 31, 1976 47.30 million
Dec 31, 1975 46.95 million
Dec 31, 1974 46.79 million
Dec 31, 1973 46.30 million
Dec 31, 1972 45.72 million
Dec 31, 1971 44.93 million
Dec 31, 1970 44.73 million
Dec 31, 1969 44.09 million
Dec 31, 1968 43.51 million
Dec 31, 1967 42.74 million
Dec 31, 1966 42.26 million
Dec 31, 1965 41.69 million
Dec 31, 1964 41.34 million
Dec 31, 1963 40.89 million
Dec 31, 1962 40.40 million
Dec 31, 1961 39.62 million
Dec 31, 1960 39.25 million
Dec 31, 1959 38.41 million
Dec 31, 1958 37.91 million
Dec 31, 1957 37.72 million
Dec 31, 1956 37.05 million
Dec 31, 1955 36.25 million
Dec 31, 1954 35.93 million
Dec 31, 1953 35.58 million
Dec 31, 1952 35.16 million
Dec 31, 1951 34.39 million
Dec 31, 1950 34.08 million
Dec 31, 1949 33.26 million
Dec 31, 1948 31.90 million
Dec 31, 1947 30.61 million
Dec 31, 1940 26.57 million