DJF MAM JJA SON 1905 986.091 982.411 991.153 984.618 1906 986.772 985.208 991.123 981.336 1907 987.026 982.904 993.259 984.667 1908 987.222 984.358 985.894 983.923 1909 989.582 985.706 984.932 984.196 1910 987.305 987.04 990.391 981.109 1911 992.516 991.055 986.494 983.576 1912 989.627 985.847 987.167 983.567 1913 986.339 987.847 985.37 983.13 1914 987.09 987.192 983.348 983.316 1915 986.479 991.684 990.886 985.084 1916 987.746 991.208 989.766 984.939 1917 985.331 987.898 991.844 979.888 1918 986.023 987.157 989.932 984.456 1919 985.221 983.159 984.784 984.548 1920 987.663 982.699 988.375 983.699 1921 989.205 987.546 990.695 978.877 1922 989.312 987.035 988.726 981.839 1923 985.723 991.503 992.594 985.24 1924 989.028 987.42 986.263 978.698 1925 992.888 985.194 987.789 985.793 1926 989.075 984.752 988.809 987.937 1927 983.859 991.063 986.833 984.333 1928 991.285 982.464 984.264 984.797 1929 989.585 986.137 986.863 983.69 1930 989.537 978.894 990.977 982.685 1931 988.113 983.417 988.792 982.374 1932 992.094 984.378 987.927 983.302 1933 986.138 983.884 986.452 982.075 1934 986.409 984.108 986.349 982.204 1935 988.386 986.946 987.81 984.598 1936 991.299 986.734 984.93 981.078 1937 987.63 989.524 986.612 981.222 1938 991.131 988.074 985.024 983.085 1939 987.899 984.739 991.257 983.015 1940 985.115 988.432 980.252 982.652 1941 988.96 987.485 987.641 984.369 1942 985.82 985.047 988.136 983.954 1943 983.707 985.612 987.675 982.475 1944 989.591 983.128 986.168 986.101 1945 990.006 985.099 990.33 981.576 1946 991.267 985.136 990.18 987.724 1947 988.441 982.981 988.999 979.072 1948 991.493 985.429 989.955 984.32 1949 993.47 983.646 988.474 980.218 1950 987.842 988.661 989.287 982.158 1951 990.517 988.226 986.185 987.583 1952 988.396 986.955 984.974 983.781 1953 989.545 984.295 988.032 986.16 1954 991.279 987.711 991.202 983.414 1955 992.059 988.04 989.781 983.591 1956 991.972 992.599 988.134 982.806 1957 992.763 985.769 987.587 986.159 1958 988.219 987.59 987.732 985.386 1959 989.626 987.983 986.278 984.643 1960 989.576 987 988.306 984.047 1961 986.141 988.038 988.75 985.194 1962 985.421 985.576 990.445 985.771 1963 990.35 984.806 990.21 986.556 1964 996.375 983.889 993.44 985.058 1965 991.626 986.488 985.251 985.748 1966 993.009 989.577 987.653 984.057 1967 990.709 986.612 985.603 984.993 1968 995.522 990.136 987.104 986.134 1969 988.542 986.496 984.735 986.991 1970 992.234 989.542 985.669 986.98 1971 993.535 990.946 988.733 984.669 1972 990.004 987.262 989.215 986.414 1973 986.078 987.146 985.229 983.681 1974 990.34 985.305 991.694 985.104 1975 989.695 989.557 989.464 985.429 1976 994.093 985.401 988.609 987.557 1977 986.391 990.089 988.103 983.851 1978 987.324 989.165 988.49 984.89 1979 992.098 986.31 986.108 985.263 1980 989.577 987.917 987.419 984.521 1981 987.633 987.236 990.385 983.877 1982 992.882 984.714 985.724 986.425 1983 991.759 989.291 986.177 982.409 1984 991.138 987.855 986.92 984.654 1985 989.867 991.234 984.632 983.906 1986 990.641 989.119 987.323 982.324 1987 987.951 987.53 986.567 983.637 1988 988.271 986.333 986.827 985.691 1989 987.308 986.867 985.954 983.579 1990 988.647 991.742 987.512 982.872 1991 990.555 988.386 987.264 986.907 1992 988.59 987.208 986.18 986.055 1993 986.72 986.072 983.868 984.2 1994 985.422 986.88 986.821 986.282 1995 986.732 984.836 996.659 984.146 1996 986.643 982.01 987.274 984.958 1997 987.606 981.766 985.431 986.905 1998 984.151 980.31 984.476 981.392 1999 983.368 982.317 985.221 980.811 2000 990.05 982.599 986.792 985.422 2001 985.261 984.782 984.938 981.522 2002 987.596 988.517 985.063 987.896 2003 987.734 982.776 985.521 985.539 2004 987.349 982.624 983.289 984.327 2005 989.743 983.927 985.578 983.471 2006 987.565 984.901 986.506 983.69 2007 984.323 987.794 994.185 990.34 2008 984.264 986.342 986.163 982.836 2009 988.862 988.53 988.811 985.222 2010 985.741 985.233 978.555 983.925 2011 985.707 989.914 984.531