Yearly sunspots data 1700-2008
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Description
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Yearly (1700-2008) data on sunspots from the National
Geophysical Data Center.

Notes
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::

    Number of Observations - 309 (Annual 1700 - 2008)
    Number of Variables - 1
    Variable name definitions::

        SUNACTIVITY - Number of sunspots for each year

    The data file contains a 'YEAR' variable that is not returned by load.


Source
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http://www.ngdc.noaa.gov/stp/solar/solarda3.html

The original dataset contains monthly data on sunspot activity in the file
./src/sunspots_yearly.dat.  There is also sunspots_monthly.dat.


Copyright
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This data is public domain.