Year Number 1950 82.268 1951 83.469 1952 84.25 1953 84.908 1954 85.541 1955 86.108 1956 87.089 1957 88.068 1958 88.915 1959 89.516 1960 89.842 1961 90.593 1962 91.01 1963 91.187 1964 91.297 1965 91.435 1966 91.911 1967 92.338 1968 92.695 1969 92.948 1970 93.085 1971 93.659 1972 94.119 1973 94.459 1974 94.685 1975 94.803 1976 94.92 1977 94.839 1978 94.606 1979 94.259 1980 93.812 1981 94.338 1982 94.724 1983 94.946 1984 94.961 1985 94.727 1986 94.53 1987 94.191 1988 93.797 1989 93.388 1990 92.943 1991 91.586 1992 90.276 1993 89.024 1994 87.799 1995 86.565 1996 86.325 1997 86.029 1998 85.636 1999 85.084 2000 84.311 2001 83.764 2002 82.881 2003 81.794 2004 80.657 2005 79.538 2006 77.915 2007 76.427 2008 75.036 2009 73.667 2010 72.31 2011 71.128 2012 69.996 2013 68.952 2014 68.04 2015 67.266 2016 67.073 2017 66.835 2018 66.593 2019 66.373 2020 66.15 2021 65.926 2022 65.718 2023 65.449 2024 65.011 2025 64.352 2026 63.589 2027 62.673 2028 61.631 2029 60.521 2030 59.386 2031 58.314 2032 57.228 2033 56.153 2034 55.112 2035 54.123 2036 53.271 2037 52.465 2038 51.723 2039 51.053 2040 50.458 2041 49.996 2042 49.591 2043 49.247 2044 48.965 2045 48.743 2046 48.611 2047 48.528 2048 48.478 2049 48.442 2050 48.41 2051 48.426 2052 48.443 2053 48.459 2054 48.473 2055 48.49 2056 48.549 2057 48.599 2058 48.647 2059 48.705 2060 48.778 2061 48.892 2062 49.01 2063 49.123 2064 49.213 2065 49.272 2066 49.318 2067 49.336 2068 49.335 2069 49.327 2070 49.321 2071 49.344 2072 49.357 2073 49.382 2074 49.445 2075 49.564 2076 49.766 2077 50.01 2078 50.286 2079 50.582 2080 50.887 2081 51.243 2082 51.601 2083 51.955 2084 52.303 2085 52.639 2086 52.993 2087 53.326 2088 53.643 2089 53.945 2090 54.233 2091 54.527 2092 54.8 2093 55.06 2094 55.315 2095 55.573 2096 55.842 2097 56.107 2098 56.374 2099 56.647 2100 56.93