Year Number 1950 80.293 1951 80.926 1952 81.214 1953 81.521 1954 81.926 1955 82.398 1956 83.468 1957 84.466 1958 85.37 1959 86.176 1960 86.889 1961 87.751 1962 88.559 1963 89.174 1964 89.388 1965 89.108 1966 89.142 1967 88.456 1968 87.325 1969 86.09 1970 84.908 1971 83.678 1972 82.589 1973 81.516 1974 80.283 1975 78.858 1976 77.726 1977 76.441 1978 75.096 1979 73.822 1980 72.681 1981 72.003 1982 71.315 1983 70.636 1984 69.94 1985 69.186 1986 68.596 1987 67.854 1988 66.991 1989 66.033 1990 64.99 1991 63.842 1992 62.682 1993 61.472 1994 60.188 1995 58.853 1996 57.618 1997 56.426 1998 55.283 1999 54.207 2000 53.214 2001 52.584 2002 51.927 2003 51.285 2004 50.68 2005 50.096 2006 49.532 2007 48.934 2008 48.323 2009 47.733 2010 47.184 2011 46.504 2012 45.998 2013 45.579 2014 45.143 2015 44.66 2016 44.405 2017 44.033 2018 43.643 2019 43.376 2020 43.292 2021 43.295 2022 43.463 2023 43.761 2024 44.116 2025 44.49 2026 44.903 2027 45.343 2028 45.799 2029 46.264 2030 46.731 2031 47.167 2032 47.605 2033 48.047 2034 48.499 2035 48.969 2036 49.42 2037 49.886 2038 50.386 2039 50.946 2040 51.582 2041 52.225 2042 52.937 2043 53.724 2044 54.585 2045 55.521 2046 56.45 2047 57.456 2048 58.516 2049 59.592 2050 60.659 2051 61.62 2052 62.575 2053 63.523 2054 64.459 2055 65.371 2056 66.122 2057 66.859 2058 67.603 2059 68.394 2060 69.265 2061 70.056 2062 70.927 2063 71.876 2064 72.89 2065 73.954 2066 74.867 2067 75.849 2068 76.858 2069 77.821 2070 78.688 2071 79.23 2072 79.685 2073 80.094 2074 80.516 2075 80.986 2076 81.273 2077 81.64 2078 82.065 2079 82.515 2080 82.976 2081 83.223 2082 83.518 2083 83.857 2084 84.235 2085 84.653 2086 84.833 2087 85.063 2088 85.35 2089 85.69 2090 86.065 2091 86.16 2092 86.325 2093 86.545 2094 86.799 2095 87.076 2096 87.094 2097 87.182 2098 87.33 2099 87.525 2100 87.767