Year Number 1950 83.014 1951 83.804 1952 84.156 1953 84.285 1954 84.317 1955 84.284 1956 85.199 1957 85.93 1958 86.509 1959 86.977 1960 87.377 1961 88.845 1962 89.991 1963 90.955 1964 91.869 1965 92.785 1966 94.088 1967 95.284 1968 96.362 1969 97.247 1970 97.909 1971 97.593 1972 96.992 1973 96.297 1974 95.784 1975 95.616 1976 94.156 1977 93.167 1978 92.498 1979 91.985 1980 91.593 1981 92.056 1982 92.265 1983 92.353 1984 92.402 1985 92.353 1986 92.451 1987 92.452 1988 92.282 1989 91.725 1990 90.605 1991 87.089 1992 83.401 1993 79.578 1994 75.703 1995 71.851 1996 70.89 1997 69.549 1998 68.133 1999 66.808 2000 65.61 2001 64.272 2002 62.693 2003 61.017 2004 59.377 2005 57.802 2006 52.853 2007 48.853 2008 45.715 2009 43.259 2010 41.387 2011 37.614 2012 34.637 2013 32.497 2014 31.048 2015 30.042 2016 31.322 2017 32.51 2018 33.625 2019 34.64 2020 35.507 2021 36.247 2022 36.797 2023 37.179 2024 37.395 2025 37.442 2026 37.271 2027 36.955 2028 36.55 2029 36.122 2030 35.716 2031 35.383 2032 35.071 2033 34.83 2034 34.694 2035 34.676 2036 34.789 2037 35.021 2038 35.395 2039 35.924 2040 36.624 2041 37.49 2042 38.48 2043 39.634 2044 40.985 2045 42.535 2046 44.105 2047 45.831 2048 47.669 2049 49.535 2050 51.363 2051 53.044 2052 54.653 2053 56.175 2054 57.601 2055 58.923 2056 59.986 2057 60.908 2058 61.71 2059 62.419 2060 63.044 2061 63.412 2062 63.72 2063 63.973 2064 64.175 2065 64.343 2066 64.339 2067 64.316 2068 64.343 2069 64.493 2070 64.809 2071 65.121 2072 65.594 2073 66.251 2074 67.092 2075 68.106 2076 69.129 2077 70.343 2078 71.706 2079 73.148 2080 74.621 2081 75.947 2082 77.291 2083 78.632 2084 79.935 2085 81.167 2086 82.08 2087 82.898 2088 83.616 2089 84.237 2090 84.76 2091 84.905 2092 84.959 2093 84.946 2094 84.896 2095 84.825 2096 84.444 2097 84.061 2098 83.718 2099 83.458 2100 83.309