Quick graphs based on the data (hopefully these pictures aren't too large!)
Useful equations for others to mess around with the spreadsheet:
=unique(range) Returns unique values in a range, discarding duplicates
Example: =unique(D:D) would show all unique 'Category A' descriptions
=countif(range, criterion) Returns a conditional count in a range
Example: =unique(D:D, W2) where cell W2 = Puzzle would show the number of times 'Puzzle' appears in 'Category A'
=SUMPRODUCT(--(ISNUMBER(FIND(criterion, range)))) Returns a conditional count in range, includes partial matches
Example: =SUMPRODUCT(--(ISNUMBER(FIND(X2, N:N)))) where cell X2 = 2008 would show the number of times '2008' appears in 'Archive.Date (UTC)'
=countblank(range) Returns count of blank cells in a range