DJF MAM JJA SON 1905 992.055 995.442 991.467 984.926 1906 989.625 987.471 993.844 985.936 1907 990.882 986.034 996.05 988.331 1908 991.093 990.044 990.271 985.705 1909 990.984 988.956 988.864 987.71 1910 991.91 992.277 991.063 985.413 1911 995.724 996.628 992.359 989.283 1912 990.913 986.94 992.76 985.9 1913 992.151 987.891 995.323 986.996 1914 989.343 989.71 994.442 985.868 1915 992.757 989.943 991.464 989.33 1916 989.394 992.737 995.063 987.86 1917 988.286 991.704 991.238 987.945 1918 993.499 990.438 995.544 988.691 1919 991.012 995.693 989.387 983.135 1920 991.88 991.345 991.318 987.938 1921 989.946 993.198 991.933 990.246 1922 993.299 989.052 989.209 988.363 1923 990.38 989.213 996.807 990.631 1924 988.365 991.946 991.283 988.085 1925 997.813 986.994 992.648 987.794 1926 993.005 995.338 995.852 988.049 1927 987.769 986.674 991.507 988.478 1928 993.916 992.746 992.747 988.712 1929 992.143 991.423 989.968 985.282 1930 993.575 988.5 993.903 989.42 1931 990.619 992.311 990.052 988.656 1932 992.162 991.383 995.047 984.636 1933 989.662 991.266 991.853 985.935 1934 988.634 990.339 989.957 988.063 1935 992.214 986.935 993.863 987.61 1936 994.046 988.775 994.016 985.921 1937 988.856 991.806 992.732 986.317 1938 993.36 993.475 988.111 986.055 1939 994.988 992.763 994.167 986.394 1940 990.939 987.847 991.881 989.026 1941 993.33 993.064 992.657 986.458 1942 991.427 993.279 991.759 990.401 1943 989.593 988.59 989.824 985.754 1944 995.06 992.1 992.523 989.189 1945 993.355 991.912 994.493 985.174 1946 993.129 993.669 995.02 986.485 1947 990.746 990.854 992.419 984.35 1948 992.099 990.875 992.914 988.708 1949 994.505 992.274 989.758 985.991 1950 988.282 992.4 991.226 988.363 1951 992.888 993.878 992.081 989.484 1952 987.199 990.418 996.497 986.913 1953 991.573 990.834 989.741 987.985 1954 991.539 991.875 992.624 988.727 1955 993.224 989.367 993.814 989.569 1956 992.031 997.021 993.424 988.321 1957 993.188 990.37 994.728 989.679 1958 986.369 994.014 994.24 986.866 1959 990.809 988.477 994.811 985.958 1960 990.679 989.459 990.876 986.532 1961 989.299 988.292 994.508 985.362 1962 988.115 993.849 991.428 991.002 1963 991.199 988.084 995.695 990.509 1964 995.469 991.385 992.621 988.705 1965 992.013 992.584 993.616 983.514 1966 992.858 990.39 993.083 987.464 1967 990.307 989.508 992.29 986.875 1968 991.114 990.505 986.297 987.346 1969 989.958 988.934 993.519 985.01 1970 991.812 987.871 992.851 989.606 1971 993.539 992.391 993.13 987.385 1972 991.916 992.317 995.647 990.311 1973 989.801 987.244 993.982 989.833 1974 991.177 990.298 994.107 987.553 1975 990.549 991.338 993.582 988.125 1976 993.339 989.738 987.756 993.767 1977 991.704 989.595 996.116 987.213 1978 991.09 996.926 990.767 988.899 1979 993.675 993.053 991.684 989.606 1980 990.18 993.609 992.788 989.831 1981 990.381 994.878 992.6 987.506 1982 994.314 989.225 996.13 988.405 1983 989.881 995.253 991.098 987.511 1984 992.942 990.691 997.663 990.664 1985 987.195 992.797 993.116 990.087 1986 990.548 992.947 986.718 989.091 1987 991.267 991.064 995.216 988.661 1988 989.809 993.028 992.671 990.318 1989 992.549 990.838 992.507 988.32 1990 990.68 992.316 988.831 985.81 1991 993.232 991.631 991.521 991.469 1992 994.909 995.793 995.601 990.495 1993 989.073 990.122 992.741 987.315 1994 991.405 994.479 996.635 990.2 1995 989.214 992.225 991.762 989.6 1996 990.123 987.847 992.418 989.716 1997 991.912 993.296 995.106 990.955 1998 987.209 997.024 987.601 988.62 1999 987.708 992.979 993.254 990.011 2000 990.41 995.295 998.916 993.684 2001 988.8 992.706 991.473 989.766 2002 990.953 991.157 995.32 993.468 2003 990.544 994.286 991.546 988.028 2004 989.313 993.413 992.53 989.263 2005 991.265 989.323 995.631 993.716 2006 988.492 991.193 997.312 989.134 2007 987.354 992.087 991.516 993.569 2008 985.109 990.483 994.788 991.073 2009 990.639 989.352 993.783 987.568 2010 988.526 988.241 989.692 989.894 2011 988.256 996.208 991.512