Choose from the options below and click "Plot" to create a time series graph.
Data are available from January 1895 through April 2013.
Move mouse towards an axis until highlighted. Left-click mouse to pan. Shift key + left-click to zoom.
| 1896 | 1897 | 1898 | 1899 | 1900 | 1901 | 1902 | 1903 | 1904 | 1905 | 1906 | 1907 | 1908 | 1909 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | 1917 | 1918 | 1919 | 1920 | 1921 | 1922 | 1923 | 1924 | 1925 | 1926 | 1927 | 1928 | 1929 | 1930 | 1931 | 1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959 | 1960 | 1961 | 1962 | 1963 | 1964 | 1965 | 1966 | 1967 | 1968 | 1969 | 1970 | 1971 | 1972 | 1973 | 1974 | 1975 | 1976 | 1977 | 1978 | 1979 | 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 | 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18.63" | 21.39" | 18.09" | 20.45" | 19.54" | 20.03" | 18.78" | 22.50" | 18.46" | 19.36" | 20.78" | 22.12" | 20.96" | 19.99" | 18.63" | 18.54" | 23.08" | 20.47" | 21.19" | 20.65" | 22.09" | 18.78" | 16.61" | 21.75" | 21.98" | 21.58" | 21.50" | 19.15" | 20.54" | 17.56" | 20.01" | 23.69" | 20.62" | 20.94" | 18.80" | 17.55" | 21.64" | 21.07" | 17.55" | 20.50" | 19.31" | 21.37" | 21.38" | 18.59" | 18.37" | 20.85" | 22.36" | 20.95" | 19.44" | 21.59" | 21.29" | 21.08" | 20.77" | 21.05" | 20.42" | 19.95" | 22.03" | 18.88" | 17.46" | 18.13" | 18.86" | 18.61" | 22.93" | 18.35" | 21.49" | 20.39" | 20.85" | 18.16" | 18.99" | 20.79" | 20.08" | 19.09" | 19.54" | 21.79" | 20.11" | 20.11" | 21.22" | 25.22" | 23.05" | 23.22" | 19.84" | 17.26" | 23.38" | 22.50" | 21.52" | 17.44" | 21.69" | 24.91" | 23.02" | 20.62" | 21.83" | 22.32" | 18.82" | 19.80" | 20.44" | 22.29" | 20.99" | 23.47" | 20.71" | 22.49" | 20.75" | 24.62" | 24.17" | 21.91" | 18.08" | 19.08" | 19.37" | 21.56" | 20.59" | 23.81" | 20.39" | 22.00" | 21.12" | 20.94" | 23.34" | 20.94" | 19.87" | 19.89" |
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