Year Number 1950 82.037 1951 83.451 1952 85.388 1953 86.925 1954 87.831 1955 88.286 1956 90.096 1957 90.939 1958 91.385 1959 91.917 1960 92.68 1961 93.551 1962 94.7 1963 95.853 1964 96.57 1965 96.674 1966 96.925 1967 96.605 1968 95.878 1969 94.989 1970 94.067 1971 93.601 1972 92.924 1973 92.105 1974 91.18 1975 90.161 1976 89.417 1977 88.536 1978 87.53 1979 86.394 1980 85.138 1981 84.043 1982 82.848 1983 81.583 1984 80.288 1985 78.996 1986 77.965 1987 76.911 1988 75.858 1989 74.818 1990 73.791 1991 72.995 1992 72.146 1993 71.275 1994 70.412 1995 69.563 1996 68.866 1997 68.196 1998 67.515 1999 66.766 2000 65.93 2001 65.208 2002 64.38 2003 63.5 2004 62.654 2005 61.892 2006 61.015 2007 60.284 2008 59.639 2009 58.993 2010 58.315 2011 57.738 2012 57.098 2013 56.468 2014 55.948 2015 55.578 2016 55.294 2017 55.139 2018 55.065 2019 55 2020 54.904 2021 54.77 2022 54.621 2023 54.463 2024 54.311 2025 54.177 2026 54.022 2027 53.883 2028 53.764 2029 53.67 2030 53.607 2031 53.537 2032 53.497 2033 53.489 2034 53.516 2035 53.575 2036 53.614 2037 53.692 2038 53.802 2039 53.935 2040 54.092 2041 54.208 2042 54.345 2043 54.514 2044 54.721 2045 54.966 2046 55.16 2047 55.398 2048 55.681 2049 56.005 2050 56.375 2051 56.696 2052 57.067 2053 57.485 2054 57.94 2055 58.424 2056 58.819 2057 59.251 2058 59.721 2059 60.224 2060 60.758 2061 61.184 2062 61.653 2063 62.157 2064 62.68 2065 63.214 2066 63.595 2067 64.003 2068 64.445 2069 64.932 2070 65.473 2071 65.88 2072 66.352 2073 66.886 2074 67.474 2075 68.109 2076 68.574 2077 69.103 2078 69.692 2079 70.327 2080 71 2081 71.471 2082 71.999 2083 72.575 2084 73.193 2085 73.846 2086 74.276 2087 74.762 2088 75.303 2089 75.889 2090 76.514 2091 76.9 2092 77.348 2093 77.85 2094 78.4 2095 78.997 2096 79.337 2097 79.738 2098 80.198 2099 80.719 2100 81.297