DJF	MAM	JJA	SON
1905	990.8	992.143	990.629	984.201
1906	988.0	986.971	995.069	987.163
1907	989.9	987.775	997.363	989.755
1908	990.7	989.742	990.838	987.89
1909	990.9	988.583	990.17	990.649
1910	990.1	992.672	992.328	987.248
1911	994.6	996.562	991.435	990.266
1912	990.1	985.623	993.245	985.934
1913	990.3	987.832	995.813	986.522
1914	988.6	988.848	994.826	985.405
1915	990.1	991.093	992.906	992.691
1916	988.1	991.543	997.496	989.376
1917	987.8	991.548	991.668	991.473
1918	990.5	991.702	995.905	992.526
1919	990.6	994.162	989.998	985.19
1920	990.5	990.622	993.147	989.31
1921	991.7	993.729	991.042	990.72
1922	992.4	987.236	990.569	989.825
1923	987.3	989.665	996.146	992.665
1924	989.3	990.846	991.821	989.889
1925	997.5	987.78	992.601	987.469
1926	990.3	993.665	996.818	990.065
1927	986.4	990.312	991.64	990.254
1928	991.7	993.523	994.923	990.443
1929	989.1	990.593	989.75	986.556
1930	991.0	987.747	992.779	991.014
1931	989.3	992.76	990.346	989.525
1932	991.8	991.848	995.826	984.184
1933	990.6	989.153	992.388	986.342
1934	988.6	989.707	990.474	988.658
1935	992.2	986.959	996.495	989.701
1936	990.5	989.685	995.099	988.517
1937	989.0	991.691	993.589	986.662
1938	991.3	994.23	989.063	986.284
1939	993.5	992.695	994.379	986.07
1940	988.9	987.844	992.423	990.947
1941	991.4	992.185	993.251	988.39
1942	989.2	991.528	992.39	995.875
1943	988.1	988.686	991.636	987.857
1944	993.9	989.476	992.592	994.343
1945	991.3	992.655	995.967	988.361
1946	991.6	996.002	995.794	988.752
1947	988.5	990.175	993.883	985.258
1948	990.0	990.853	993.945	990.121
1949	993.6	992.686	990.799	985.27
1950	987.8	994.488	992.218	990.201
1951	991.7	994.003	991.678	992.853
1952	986.5	989.713	997.106	987.768
1953	988.8	989.845	991.065	989.421
1954	991.7	991.489	993.836	989.177
1955	991.7	990.235	993.755	990.177
1956	990.9	997.954	996.607	988.293
1957	992.4	989.828	993.424	990.891
1958	986.8	993.106	993.725	986.793
1959	990.4	988.569	995.094	985.28
1960	991.2	989.03	990.612	986.354
1961	988.2	987.876	993.784	983.735
1962	986.7	993.462	992.095	992.082
1963	990.6	987.075	995.982	991.13
1964	996.1	990.27	994.333	991.135
1965	990.7	992.02	994.192	983.055
1966	991.6	989.155	993.08	988.363
1967	990.0	989.894	995.359	987.426
1968	991.4	989.566	987.259	988.86
1969	989.5	989.305	994.258	984.87
1970	990.9	988.078	995.124	992.167
1971	992.8	993.885	994.623	989.505
1972	990.1	993.265	996.816	990.407
1973	988.4	987.107	995.004	990.468
1974	991.1	991.55	995.285	988.464
1975	989.9	991.766	993.984	988.431
1976	993.1	989.366	986.636	992.938
1977	990.8	988.379	997.079	986.347
1978	990.3	997.063	990.995	988.347
1979	993.2	992.584	989.776	988.765
1980	990.4	992.425	992.201	988.84
1981	988.4	994.443	992.096	987.162
1982	993.3	988.385	995.591	986.302
1983	989.2	995.547	991.871	987.373
1984	993.3	991.681	998.033	990.93
1985	987.7	991.927	992.814	989.884
1986	989.6	993.32	986.138	987.216
1987	990.3	990.669	995.578	987.944
1988	987.9	992.817	993.545	991.356
1989	991.3	990.302	993.41	988.326
1990	990.3	993.07	987.903	984.051
1991	993.7	990.78	990.933	991.847
1992	995.5	996.037	997.348	990.672
1993	988.4	990.454	993.14	986.777
1994	991.2	993.131	996.074	989.131
1995	990.7	990.763	990.979	988.467
1996	990.6	988.491	989.903	989.784
1997	991.2	991.404	993.395	990.639
1998	986.8	994.866	987.502	986.988
1999	987.5	993.531	992.196	988.445
2000	991.1	996.476	999.13	993.683
2001	988.8	993.119	989.951	988.811
2002	991.1	991.581	994.639	994.389
2003	991.5	993.189	991.645	988.349
2004	990.8	991.824	991.905	988.898
2005	991.7	989.61	995.005	993.429
2006	988.4	991.193	997.35	988.706
2007	987.8	990.211	991.487	991.067
2008	985.3	992.133	996.247	991.735
2009	991.6	988.62	994.733	986.643
2010	988.4	987.737	992.18	992.04
2011		988.889	997.852	991.913
2012		992.387		987.904
2013		992.878		988.731