Year Number 1950 89.108 1951 90.286 1952 91.061 1953 91.692 1954 92.171 1955 92.433 1956 93.368 1957 93.999 1958 94.322 1959 94.325 1960 94.023 1961 94.171 1962 94.046 1963 93.668 1964 93.061 1965 92.276 1966 92.34 1967 92.041 1968 91.532 1969 91 1970 90.541 1971 90.729 1972 90.925 1973 91.112 1974 91.233 1975 91.266 1976 91.982 1977 92.577 1978 93.051 1979 93.444 1980 93.787 1981 94.516 1982 95.162 1983 95.676 1984 95.981 1985 96.038 1986 96.304 1987 96.192 1988 95.809 1989 95.344 1990 94.909 1991 94.299 1992 93.908 1993 93.559 1994 93.034 1995 92.27 1996 91.763 1997 90.969 1998 90.018 1999 89.111 2000 88.334 2001 87.479 2002 86.715 2003 85.966 2004 85.105 2005 84.075 2006 82.843 2007 81.477 2008 80.025 2009 78.58 2010 77.198 2011 75.785 2012 74.496 2013 73.279 2014 72.07 2015 70.851 2016 69.786 2017 68.669 2018 67.553 2019 66.507 2020 65.559 2021 64.659 2022 63.843 2023 63.085 2024 62.342 2025 61.593 2026 60.862 2027 60.134 2028 59.412 2029 58.708 2030 58.032 2031 57.38 2032 56.755 2033 56.159 2034 55.595 2035 55.069 2036 54.587 2037 54.14 2038 53.733 2039 53.371 2040 53.058 2041 52.787 2042 52.558 2043 52.374 2044 52.24 2045 52.159 2046 52.109 2047 52.111 2048 52.149 2049 52.201 2050 52.257 2051 52.288 2052 52.322 2053 52.373 2054 52.462 2055 52.601 2056 52.732 2057 52.906 2058 53.121 2059 53.375 2060 53.666 2061 53.927 2062 54.225 2063 54.554 2064 54.91 2065 55.29 2066 55.62 2067 55.97 2068 56.336 2069 56.711 2070 57.09 2071 57.381 2072 57.678 2073 57.992 2074 58.334 2075 58.71 2076 59.022 2077 59.373 2078 59.759 2079 60.174 2080 60.618 2081 60.978 2082 61.367 2083 61.789 2084 62.246 2085 62.735 2086 63.115 2087 63.534 2088 63.989 2089 64.468 2090 64.968 2091 65.35 2092 65.762 2093 66.204 2094 66.676 2095 67.175 2096 67.543 2097 67.952 2098 68.396 2099 68.87 2100 69.371