1880   -0.1543
1881   -0.1033
1882   -0.1198
1883   -0.1695
1884   -0.2300
1885   -0.2032
1886   -0.1813
1887   -0.2575
1888   -0.1732
1889   -0.0901
1890   -0.3059
1891   -0.2687
1892   -0.3073
1893   -0.3434
1894   -0.3055
1895   -0.2501
1896   -0.1085
1897   -0.1495
1898   -0.2782
1899   -0.1581
1900   -0.1099
1901   -0.1661
1902   -0.2553
1903   -0.3483
1904   -0.4082
1905   -0.2871
1906   -0.2348
1907   -0.3789
1908   -0.4250
1909   -0.4281
1910   -0.4106
1911   -0.4341
1912   -0.3785
1913   -0.3458
1914   -0.1864
1915   -0.1087
1916   -0.3073
1917   -0.3443
1918   -0.2370
1919   -0.2565
1920   -0.2370
1921   -0.1674
1922   -0.2540
1923   -0.2330
1924   -0.2292
1925   -0.1589
1926   -0.0635
1927   -0.1287
1928   -0.1310
1929   -0.2491
1930   -0.0589
1931   -0.0349
1932   -0.0554
1933   -0.1984
1934   -0.0547
1935   -0.0861
1936   -0.0596
1937    0.0544
1938    0.0826
1939    0.0681
1940    0.1130
1941    0.1595
1942    0.1160
1943    0.1102
1944    0.2160
1945    0.0883
1946   -0.0454
1947   -0.0475
1948   -0.0604
1949   -0.0709
1950   -0.1610
1951   -0.0028
1952    0.0393
1953    0.1168
1954   -0.0988
1955   -0.1142
1956   -0.1746
1957    0.0663
1958    0.1175
1959    0.0739
1960    0.0235
1961    0.0981
1962    0.1251
1963    0.1441
1964   -0.1193
1965   -0.0543
1966    0.0050
1967    0.0202
1968    0.0080
1969    0.1131
1970    0.0666
1971   -0.0328
1972    0.0543
1973    0.1901
1974   -0.0538
1975    0.0158
1976   -0.0760
1977    0.1774
1978    0.0987
1979    0.1852
1980    0.2287
1981    0.2689
1982    0.1509
1983    0.3163
1984    0.1253
1985    0.1063
1986    0.1959
1987    0.3294
1988    0.3406
1989    0.2649
1990    0.3953
1991    0.3748
1992    0.2326
1993    0.2636
1994    0.3250
1995    0.4480
1996    0.3177
1997    0.5115
1998    0.6302
1999    0.4531
2000    0.4262
2001    0.5476
2002    0.6105
2003    0.6192
2004    0.5750
2005    0.6486
2006    0.5953
2007    0.5890
2008    0.5108
2009    0.5926
2010    0.6553
2011    0.5314
2012    0.5724
2013 -999.0000