Is there a database of past sunspots? I would like to plot a butterfly diagram. I've been looking through the SOHO archive for a table that would indicate the date and position of each sunspot, but to no avail. The closest I got was to use the archived images to create the table myself, but that would be extremely fastidious. 

Is there a place where I might find this kind of data?
The National Solar Observatory historical archive lists at least one source of sunspot data. Under 'Sacramento Peak Telescope'->'Evans Solar Facility' there is a Dropbox link to Sunspot numbers data which seems to have spot numbers against time in ASCII format; this may be a suitable resource to get you going.