Year Number 1950 53.344 1951 53.088 1952 52.334 1953 51.744 1954 51.496 1955 51.502 1956 51.361 1957 51.68 1958 52.172 1959 52.573 1960 52.796 1961 52.973 1962 52.991 1963 52.942 1964 52.986 1965 53.19 1966 53.64 1967 54.087 1968 54.56 1969 55.071 1970 55.614 1971 55.988 1972 56.385 1973 56.737 1974 56.946 1975 56.952 1976 56.989 1977 56.785 1978 56.307 1979 55.537 1980 54.482 1981 53.2 1982 51.706 1983 50.149 1984 48.713 1985 47.51 1986 46.835 1987 46.347 1988 46.003 1989 45.736 1990 45.509 1991 45.509 1992 45.551 1993 45.645 1994 45.794 1995 45.995 1996 46.304 1997 46.626 1998 46.986 1999 47.424 2000 47.963 2001 48.394 2002 48.939 2003 49.541 2004 50.099 2005 50.553 2006 51.033 2007 51.41 2008 51.733 2009 52.101 2010 52.587 2011 53.309 2012 54.091 2013 54.925 2014 55.762 2015 56.544 2016 57.092 2017 57.666 2018 58.24 2019 58.792 2020 59.342 2021 59.926 2022 60.493 2023 61.11 2024 61.879 2025 62.853 2026 63.903 2027 65.17 2028 66.631 2029 68.208 2030 69.846 2031 71.42 2032 73.073 2033 74.781 2034 76.544 2035 78.377 2036 80.085 2037 81.822 2038 83.58 2039 85.299 2040 86.901 2041 88.103 2042 89.2 2043 90.16 2044 90.978 2045 91.686 2046 92.018 2047 92.237 2048 92.386 2049 92.512 2050 92.631 2051 92.401 2052 92.186 2053 92.005 2054 91.859 2055 91.741 2056 91.336 2057 91.019 2058 90.768 2059 90.556 2060 90.382 2061 89.953 2062 89.595 2063 89.331 2064 89.172 2065 89.117 2066 88.862 2067 88.736 2068 88.722 2069 88.81 2070 89.01 2071 89.03 2072 89.159 2073 89.384 2074 89.669 2075 89.977 2076 89.971 2077 89.982 2078 90.03 2079 90.141 2080 90.321 2081 90.242 2082 90.244 2083 90.32 2084 90.453 2085 90.633 2086 90.531 2087 90.508 2088 90.556 2089 90.67 2090 90.854 2091 90.772 2092 90.772 2093 90.861 2094 91.043 2095 91.312 2096 91.312 2097 91.418 2098 91.624 2099 91.909 2100 92.26