1880 -0.13
1881 -0.07
1882 -0.07
1883 -0.15
1884 -0.21
1885 -0.22
1886 -0.21
1887 -0.25
1888 -0.16
1889 -0.11
1890 -0.33
1891 -0.26
1892 -0.31
1893 -0.32
1894 -0.28
1895 -0.23
1896 -0.09
1897 -0.12
1898 -0.26
1899 -0.12
1900 -0.07
1901 -0.14
1902 -0.25
1903 -0.34
1904 -0.42
1905 -0.29
1906 -0.21
1907 -0.37
1908 -0.44
1909 -0.43
1910 -0.38
1911 -0.43
1912 -0.32
1913 -0.31
1914 -0.14
1915 -0.07
1916 -0.29
1917 -0.31
1918 -0.2
1919 -0.2
1920 -0.21
1921 -0.15
1922 -0.23
1923 -0.21
1924 -0.24
1925 -0.14
1926 -0.06
1927 -0.15
1928 -0.17
1929 -0.29
1930 -0.1
1931 -0.07
1932 -0.12
1933 -0.24
1934 -0.1
1935 -0.14
1936 -0.11
1937 -0.02
1938 -0.03
1939 -0.01
1940 0.09
1941 0.2
1942 0.15
1943 0.16
1944 0.29
1945 0.17
1946 -0.01
1947 -0.05
1948 -0.05
1949 -0.06
1950 -0.16
1951 -0.01
1952 0.03
1953 0.1
1954 -0.12
1955 -0.13
1956 -0.2
1957 0.05
1958 0.11
1959 0.06
1960 0.02
1961 0.08
1962 0.09
1963 0.11
1964 -0.15
1965 -0.08
1966 -0.02
1967 -0.02
1968 -0.03
1969 0.09
1970 0.04
1971 -0.08
1972 0.03
1973 0.16
1974 -0.07
1975 0
1976 -0.08
1977 0.2
1978 0.11
1979 0.23
1980 0.26
1981 0.3
1982 0.18
1983 0.34
1984 0.15
1985 0.13
1986 0.23
1987 0.37
1988 0.37
1989 0.29
1990 0.43
1991 0.4
1992 0.25
1993 0.28
1994 0.33
1995 0.45
1996 0.32
1997 0.51
1998 0.63
1999 0.44
2000 0.42
2001 0.54
2002 0.6
2003 0.61
2004 0.58
2005 0.66
2006 0.61
2007 0.61
2008 0.54
2009 0.63
2010 0.7
2011 0.58
2012 0.62
2013 0.66
2014 0.74
2015 0.9