Year Number 1950 88.933 1951 89.759 1952 90.279 1953 90.593 1954 90.764 1955 90.823 1956 91.58 1957 92.114 1958 92.465 1959 92.662 1960 92.726 1961 93.388 1962 93.828 1963 94.104 1964 94.271 1965 94.367 1966 95.077 1967 95.594 1968 95.972 1969 96.26 1970 96.484 1971 97.244 1972 97.813 1973 98.231 1974 98.537 1975 98.756 1976 99.332 1977 99.697 1978 99.871 1979 99.851 1980 99.635 1981 99.752 1982 99.585 1983 99.181 1984 98.57 1985 97.761 1986 97.266 1987 96.516 1988 95.587 1989 94.631 1990 93.802 1991 93.143 1992 92.505 1993 91.881 1994 91.152 1995 90.199 1996 89.935 1997 89.475 1998 88.862 1999 88.227 2000 87.661 2001 87.436 2002 87.224 2003 86.979 2004 86.597 2005 86.023 2006 85.68 2007 85.064 2008 84.262 2009 83.38 2010 82.467 2011 81.663 2012 80.841 2013 79.977 2014 79.038 2015 78.035 2016 77.147 2017 76.155 2018 75.116 2019 74.091 2020 73.108 2021 72.301 2022 71.495 2023 70.699 2024 69.912 2025 69.137 2026 68.516 2027 67.881 2028 67.242 2029 66.606 2030 65.979 2031 65.481 2032 64.963 2033 64.433 2034 63.897 2035 63.359 2036 62.922 2037 62.46 2038 61.981 2039 61.493 2040 61.002 2041 60.595 2042 60.169 2043 59.728 2044 59.278 2045 58.823 2046 58.447 2047 58.054 2048 57.65 2049 57.242 2050 56.835 2051 56.508 2052 56.167 2053 55.827 2054 55.499 2055 55.192 2056 54.979 2057 54.765 2058 54.557 2059 54.355 2060 54.162 2061 54.044 2062 53.917 2063 53.788 2064 53.663 2065 53.549 2066 53.508 2067 53.458 2068 53.401 2069 53.334 2070 53.258 2071 53.23 2072 53.18 2073 53.115 2074 53.043 2075 52.968 2076 52.942 2077 52.899 2078 52.847 2079 52.792 2080 52.738 2081 52.739 2082 52.728 2083 52.712 2084 52.699 2085 52.695 2086 52.747 2087 52.795 2088 52.843 2089 52.892 2090 52.945 2091 53.057 2092 53.156 2093 53.248 2094 53.342 2095 53.443 2096 53.587 2097 53.726 2098 53.866 2099 54.005 2100 54.14