DJF	MAM	JJA	SON
1905	988.979	991.285	988.925	981.036
1906	987.625	986.089	993.412	985.076
1907	989.263	984.822	997.262	988.552
1908	991.961	988.016	988.544	984.663
1909	991.591	985.812	987.327	989.867
1910	988.444	990.124	989.868	985.614
1911	996.396	995.58	989.791	988.996
1912	989.268	984.243	991.862	984.567
1913	987.695	986.98	994.187	984.136
1914	987.723	988.134	994.747	983.792
1915	988.689	989.692	989.654	989.887
1916	988.51	990.173	994.726	985.887
1917	985.944	989.769	989.757	989.064
1918	990.74	990.551	995.42	989.848
1919	989.921	994.998	987.973	983.962
1920	990.673	991.141	989.741	986.159
1921	990.222	993.094	987.937	990.433
1922	990.11	984.788	988.834	988.083
1923	985.672	986.946	996.2	990.694
1924	988.673	988.931	988.891	989.556
1925	997.65	985.428	991.119	986.806
1926	989.696	992.29	997.355	987.894
1927	984.376	984.659	990.276	988.522
1928	992.482	991.96	993.314	989.261
1929	988.826	989.649	988.347	983.495
1930	990.656	986.45	993.061	990.261
1931	988.025	990.215	989.354	988.334
1932	991.14	990.362	995.693	980.795
1933	988.202	988.486	990.47	984.157
1934	986.364	988.123	988.148	987.602
1935	989.979	985.503	994.208	988.122
1936	989.036	988.423	993.199	987.047
1937	988.064	989.671	992.293	985.423
1938	990.772	992.985	986.833	983.869
1939	990.893	991.225	994.062	984.311
1940	988.941	986.403	991.088	989.589
1941	991.474	990.303	992.161	986.737
1942	986.489	989.401	991.095	993.554
1943	985.214	987.628	991.082	985.138
1944	992.606	988.694	991.867	990.907
1945	992.371	991.563	993.909	987.05
1946	992.471	993.861	995.746	986.204
1947	989.186	987.847	992.452	982.838
1948	990.347	988.844	992.222	989.16
1949	993.979	991.794	987.948	984.254
1950	986.881	992.988	990.08	988.411
1951	990.131	991.927	990.912	990.661
1952	984.848	987.712	996.371	986.126
1953	989.399	988.344	989.464	986.964
1954	992.069	988.67	992.795	985.923
1955	991.603	987.382	992.679	988.353
1956	989.957	995.864	994.093	986.304
1957	992.715	987.922	992.6	988.451
1958	985.603	991.284	992.726	984.168
1959	989.729	988.064	995.385	983.47
1960	991.092	986.846	989.715	983.801
1961	987.782	985.704	993.886	981.321
1962	984.489	991.631	991.047	990.087
1963	989.596	986.035	995.867	990.057
1964	997.251	988.471	992.088	989.485
1965	991.3	990.244	993	980.306
1966	990.421	988.346	992.568	986.354
1967	989.143	989.4	993.528	985.649
1968	992.383	987.856	985.511	987.814
1969	987.33	987.807	992.819	981.285
1970	990.662	986.683	992.3	988.877
1971	994.234	991.499	991.607	986.916
1972	989.526	991.796	994.64	990.482
1973	987.078	984.308	992.431	988.11
1974	989.549	988.931	992.367	985.55
1975	989.785	990.195	991.622	985.244
1976	994.343	986.541	984.845	991.248
1977	988.455	986.026	995.677	984.74
1978	987.088	994.623	989.377	985.347
1979	992.7	989.864	988.366	986.918
1980	989.224	992.79	990.926	987.138
1981	987.198	994.346	990.726	985.17
1982	993.628	986.929	995.699	985.315
1983	988.236	993.465	989.474	984.51
1984	991.577	989.445	998.097	988.103
1985	986.415	989.738	991.905	986.842
1986	987.981	992.401	983.299	986.054
1987	989.222	988.935	994.857	987.504
1988	986.855	990.571	991.783	988.43
1989	989.937	988.38	991.233	986.712
1990	988.322	991.168	984.864	981.851
1991	991.984	990.057	990.224	991.139
1992	992.999	995.094	995.61	987.957
1993	985.857	989.291	991.345	986.465
1994	988.922	990.69	994.511	987.374
1995	988.833	989.651	989.284	986.878
1996	988.85	985.962	988.861	986.931
1997	992.585	990.568	993.847	989.825
1998	985.023	993.477	984.226	985.248
1999	985.731	991.407	991.009	987.101
2000	989.879	994.282	998.368	992.506
2001	986.127	991.207	989.709	987.231
2002	989.276	990.49	994.472	991.364
2003	990.204	993.911	989.409	986.214
2004	989.553	989.186	990.451	986.663
2005	992.274	987.755	994.146	990.946
2006	988.096	989.177	996.762	986.084
2007	985.922	988.176	989.206	988.238
2008	983.157	989.92	994.824	988.656
2009	990.498	986.926	992.706	983.615
2010	985.787	985.032	989.54	988.669
2011		986.827	996.544	989.268
2012		991.139	986.654	986.415
2013		991.433	986.063	987.605