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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 18.48" | 18.40" | 21.19" | 21.67" | 20.79" | 16.49" | 20.12" | 22.83" | 16.89" | 16.39" | 17.28" | 17.30" | 25.59" | 16.39" | 18.93" | 16.08" | 19.31" | 19.66" | 19.55" | 17.61" | 16.99" | 17.07" | 16.78" | 18.95" | 19.57" | 19.91" | 17.58" | 15.17" | 19.84" | 16.61" | 21.17" | 21.41" | 23.88" | 15.90" | 18.07" | 12.55" | 17.12" | 19.99" | 17.43" | 21.16" | 19.73" | 21.49" | 19.74" | 21.29" | 15.77" | 17.27" | 15.11" | 20.28" | 16.34" | 21.24" | 21.95" | 17.48" | 15.36" | 20.40" | 18.58" | 22.39" | 22.07" | 18.92" | 17.58" | 21.39" | 18.65" | 16.88" | 21.91" | 18.08" | 23.74" | 17.73" | 17.24" | 19.02" | 17.84" | 15.21" | 17.46" | 17.84" | 16.95" | 19.85" | 20.55" | 21.38" | 19.37" | 23.44" | 21.43" | 20.12" | 25.05" | 18.04" | 28.25" | 21.78" | 17.57" | 17.74" | 21.59" | 16.22" | 24.09" | 14.90" | 21.49" | 18.57" | 19.64" | 16.16" | 20.92" | 22.25" | 18.11" | 19.45" | 23.13" | 17.56" | 25.02" | 24.98" | 21.35" | 17.27" | 22.77" | 16.36" | 14.60" | 22.21" | 24.44" | 22.08" | 27.24" | 23.45" | 24.10" | 22.16" | 21.29" | 22.89" | 23.34" | 21.79" |
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