# year value 1901 -0.2028136 1902 0.2878687 1903 -1.796947 1904 -0.2166216 1905 -0.2176157 1906 -0.5906117 1907 0.7329341 1908 0.176811 1909 -0.4650683 1910 -2.8902 1911 -0.2335403 1912 -0.9109999 1913 -2.375095 1914 -0.3814225 1915 -1.601471 1916 -1.104546 1917 -2.838156 1918 0.4131937 1919 -1.307966 1920 -0.5828837 1921 0.03927913 1922 -2.042131 1923 -0.6191978 1924 -0.5444223 1925 -0.9256025 1926 0.6212268 1927 -0.01611333 1928 -0.9783202 1929 -3.008148 1930 -0.2627186 1931 -0.3509285 1932 -2.240167 1933 -3.389685 1934 2.385841 1935 0.4734946 1936 -0.6487579 1937 -3.030573 1938 0.6261247 1939 -1.02789 1940 1.104707 1941 1.167679 1942 -0.8996918 1943 0.4412695 1944 -0.9115666 1945 0.1767636 1946 -0.7185118 1947 0.2781044 1948 -0.7089013 1949 -4.059752 1950 -1.175396 1951 0.6406094 1952 -1.694645 1953 1.211241 1954 1.032138 1955 -1.89228 1956 -0.4338371 1957 -0.4611705 1958 1.551575 1959 0.8794817 1960 -1.218666 1961 0.531593 1962 -1.278234 1963 0.516351 1964 -1.344075 1965 0.1560302 1966 -1.023425 1967 0.6444106 1968 -0.4755574 1969 -1.201894 1970 1.184298 1971 -0.1084526 1972 -0.8628944 1973 -1.918052 1974 -0.3150756 1975 -1.082034 1976 0.523488 1977 -0.06837993 1978 0.8520373 1979 -3.209375 1980 0.8688138 1981 2.176763 1982 -0.2027632 1983 0.76862 1984 -1.141135 1985 -2.139565 1986 0.8036355 1987 -0.01820914 1988 -0.6045561 1989 -1.813419 1990 -0.0004479165 1991 -0.7948667 1992 0.7998272 1993 -2.001576 1994 0.4549537 1995 1.725392 1996 1.11618 1997 0.1441698 1998 0.5072102 1999 0.9109263 2000 1.594149 2001 -0.6847473 2002 0.04242529 2003 1.572622 2004 0.02867938 2005 0.9918342 2006 1.220088 2007 -0.2624044 2008 -0.4992281 2009 0.2311026 2010 -0.629586 2011 -0.05267821 2012 0.4758379 2013 -0.4138961 2014 0.1106166 2015 2.420699 2016 1.369991 2017 -0.1839181 2018 1.004084