DJF	MAM	JJA	SON
1905	989.932	991.8	989.66	983.038
1906	986.186	989.1	994.041	984.657
1907	988.039	987.8	997.494	987.654
1908	989.703	990.2	989.822	986.574
1909	989.112	988.4	989.901	987.435
1910	988.51	991.5	993.282	984.822
1911	993.716	995.3	990.593	986.476
1912	988.065	987.0	992.446	984.146
1913	989.071	990.7	994.133	984.114
1914	988.157	989.8	992.724	983.706
1915	988.278	992.2	993.443	989.979
1916	987.459	992.7	996.039	988.945
1917	986.24	990.7	992.199	986.957
1918	989.957	993.0	994.475	990.768
1919	988.969	994.5	989.634	984.845
1920	988.645	992.7	992.897	987.235
1921	991.186	993.5	990.111	985.241
1922	990.534	987.3	990.196	985.768
1923	986.147	990.0	995.598	989.357
1924	987.665	991.6	989.951	983.577
1925	995.786	989.2	990.951	985.777
1926	988.032	992.3	996.018	989.301
1927	985.838	988.2	992.736	988.035
1928	991.422	992.5	993.902	986.506
1929	988.347	991.5	989.442	984.751
1930	990.89	988.3	994.165	987.025
1931	988.542	991.2	990.291	984.866
1932	990.333	992.2	994.927	983.696
1933	988.71	991.2	991.032	983.788
1934	987.143	990.9	989.503	984.896
1935	990.721	989.0	994.463	986.725
1936	989.651	990.0	993.623	986.077
1937	987.924	991.9	992.095	983.312
1938	991.533	994.0	987.952	984.597
1939	991.721	992.3	993.87	983.629
1940	988.308	989.2	990.642	986.295
1941	991.031	991.4	992.269	985.628
1942	988.534	990.9	992.195	991.807
1943	986.613	989.4	991.138	985.782
1944	992.254	990.3	990.994	993.067
1945	991.314	993.3	995.672	986.357
1946	990.771	993.9	996.13	988.99
1947	987.851	990.4	993.77	981.837
1948	989.193	990.6	993.216	987.159
1949	991.782	993.2	990.963	980.902
1950	987.327	994.6	991.495	985.938
1951	990.5	993.5	991.758	992.031
1952	985.539	990.3	995.329	986.273
1953	987.871	991.8	990.687	990.628
1954	989.936	991.4	993.435	988.228
1955	989.628	991.0	994.394	987.161
1956	988.708	996.5	995.124	985.994
1957	991.195	990.4	993.488	990.171
1958	986.138	992.3	993.87	986.686
1959	989.703	989.6	994.593	984.897
1960	991.371	988.8	990.63	985.902
1961	987.654	990.1	992.859	984.974
1962	986.025	993.0	991.67	989.599
1963	991.237	989.7	996.143	988.593
1964	994.411	990.4	995.246	988.184
1965	990.493	991.1	993.631	983.982
1966	990.969	990.0	992.427	986.028
1967	989.447	990.8	994.042	986.451
1968	989.807	989.1	989.366	987.876
1969	988.148	989.4	992.379	986.152
1970	989.711	989.6	993.37	990.991
1971	992.003	992.1	993.188	987.753
1972	989.555	993.2	996.072	986.98
1973	987.135	987.0	995.692	986.154
1974	989.514	991.3	994.607	985.894
1975	989.782	991.5	993.704	986.727
1976	991.894	988.9	986.467	989.811
1977	988.53	989.1	995.31	985.143
1978	988.527	995.0	990.992	987.352
1979	991.117	990.9	988.753	986.259
1980	988.968	993.9	991.534	986.032
1981	987.588	994.5	992.256	985.499
1982	992.162	989.7	993.741	986.527
1983	988.392	994.7	991.818	985.443
1984	991.05	992.0	995.926	988.706
1985	985.782	994.1	991.61	987.405
1986	989.384	994.5	986.533	984.947
1987	989.856	990.8	993.503	984.908
1988	988.215	992.1	991.969	988.366
1989	990.796	991.3	990.729	984.435
1990	989.749	992.5	987.482	983.028
1991	991.453	992.3	991.057	988.851
1992	992.566	995.1	995.445	987.636
1993	987.038	991.0	990.933	984.664
1994	988.704	992.7	993.342	986.911
1995	987.923	991.6	991.955	986.247
1996	988.929	989.1	990.348	987.254
1997	989.749	991.1	992.842	989.039
1998	984.731	992.5	988.176	983.073
1999	985.834	991.8	991.021	984.094
2000	989.42	994.4	997.139	989.994
2001	987.237	992.9	988.743	984.514
2002	989.096	992.2	993.219	993.74
2003	989.695	992.4	990.811	987.829
2004	988.407	990.6	990.283	987.113
2005	990.07	991.2	993.485	988.696
2006	988.307	991.1	993.678	986.972
2007	985.605	991.5	990.71	991.051
2008	984.617	992.8	992.829	987.473
2009	990.969	991.4	994.166	987.831
2010	987.018	988.6	989.265	987.896
2011	985.201	991.3	995.813	988.822
2012	986.24		988.332	
2013	987.343		988.472