1880   -0.0828
1881   -0.0207
1882   -0.0511
1883   -0.0580
1884   -0.1312
1885   -0.1171
1886   -0.1005
1887   -0.2158
1888   -0.1028
1889   -0.0485
1890   -0.2618
1891   -0.1840
1892   -0.2519
1893   -0.2805
1894   -0.2931
1895   -0.1962
1896   -0.0602
1897   -0.0986
1898   -0.2413
1899   -0.1472
1900   -0.1085
1901   -0.2081
1902   -0.2435
1903   -0.3457
1904   -0.3985
1905   -0.2483
1906   -0.2588
1907   -0.3110
1908   -0.4180
1909   -0.4517
1910   -0.4453
1911   -0.4364
1912   -0.3307
1913   -0.3577
1914   -0.2316
1915   -0.1304
1916   -0.2831
1917   -0.2661
1918   -0.1821
1919   -0.2286
1920   -0.2151
1921   -0.2094
1922   -0.2663
1923   -0.2467
1924   -0.2219
1925   -0.1835
1926   -0.0871
1927   -0.1228
1928   -0.1458
1929   -0.1907
1930   -0.0543
1931   -0.0427
1932   -0.0842
1933   -0.1496
1934   -0.0664
1935   -0.0712
1936   -0.0413
1937    0.0765
1938    0.0334
1939    0.0421
1940    0.1312
1941    0.1900
1942    0.1415
1943    0.1256
1944    0.2288
1945    0.1896
1946   -0.0527
1947   -0.0915
1948   -0.1011
1949   -0.0743
1950   -0.0902
1951    0.0237
1952    0.0869
1953    0.0944
1954   -0.0751
1955   -0.1088
1956   -0.0763
1957    0.1157
1958    0.1164
1959    0.0835
1960    0.0536
1961    0.1005
1962    0.1136
1963    0.1194
1964   -0.0728
1965   -0.0262
1966    0.0328
1967    0.0274
1968    0.0539
1969    0.1907
1970    0.0836
1971   -0.0300
1972    0.1412
1973    0.1503
1974    0.0085
1975   -0.0209
1976   -0.0039
1977    0.1692
1978    0.1072
1979    0.2017
1980    0.2149
1981    0.1895
1982    0.1739
1983    0.2564
1984    0.1546
1985    0.1216
1986    0.1690
1987    0.3028
1988    0.2668
1989    0.2251
1990    0.3315
1991    0.3187
1992    0.2276
1993    0.2382
1994    0.2764
1995    0.3303
1996    0.3112
1997    0.4570
1998    0.5158
1999    0.3313
2000    0.3525
2001    0.4493
2002    0.4900
2003    0.5206
2004    0.4885
2005    0.5004
2006    0.4790
2007    0.4049
2008    0.3846
2009    0.4951
2010    0.5021
2011    0.4014
2012    0.4500
2013 -999.0000