Year Number 1950 69.794 1951 70.779 1952 72.038 1953 73.174 1954 74.041 1955 74.664 1956 75.833 1957 76.556 1958 77.036 1959 77.459 1960 77.893 1961 78.514 1962 79.094 1963 79.566 1964 79.808 1965 79.771 1966 79.84 1967 79.632 1968 79.179 1969 78.514 1970 77.654 1971 76.969 1972 75.975 1973 74.761 1974 73.43 1975 72.035 1976 70.525 1977 69.069 1978 67.621 1979 66.12 1980 64.568 1981 63.174 1982 61.765 1983 60.404 1984 59.191 1985 58.181 1986 57.457 1987 56.886 1988 56.449 1989 56.083 1990 55.74 1991 55.606 1992 55.375 1993 55.092 1994 54.807 1995 54.528 1996 54.111 1997 53.752 1998 53.376 1999 52.889 2000 52.26 2001 51.585 2002 50.796 2003 49.948 2004 49.134 2005 48.411 2006 47.831 2007 47.306 2008 46.84 2009 46.425 2010 46.057 2011 45.795 2012 45.563 2013 45.381 2014 45.27 2015 45.243 2016 45.355 2017 45.538 2018 45.786 2019 46.081 2020 46.417 2021 46.856 2022 47.327 2023 47.834 2024 48.383 2025 48.976 2026 49.657 2027 50.385 2028 51.157 2029 51.975 2030 52.838 2031 53.684 2032 54.565 2033 55.469 2034 56.368 2035 57.243 2036 58 2037 58.738 2038 59.457 2039 60.161 2040 60.864 2041 61.463 2042 62.057 2043 62.672 2044 63.335 2045 64.06 2046 64.702 2047 65.407 2048 66.19 2049 67.067 2050 68.056 2051 69.002 2052 70.064 2053 71.219 2054 72.421 2055 73.638 2056 74.681 2057 75.738 2058 76.806 2059 77.877 2060 78.94 2061 79.779 2062 80.616 2063 81.442 2064 82.253 2065 83.061 2066 83.636 2067 84.209 2068 84.792 2069 85.395 2070 86.022 2071 86.398 2072 86.803 2073 87.242 2074 87.714 2075 88.215 2076 88.446 2077 88.722 2078 89.056 2079 89.438 2080 89.856 2081 90.021 2082 90.264 2083 90.559 2084 90.885 2085 91.248 2086 91.365 2087 91.541 2088 91.778 2089 92.072 2090 92.414 2091 92.499 2092 92.648 2093 92.854 2094 93.11 2095 93.406 2096 93.432 2097 93.532 2098 93.702 2099 93.92 2100 94.163