I am updating Windows 7, and I keep noticing that all the optional language packs are of different sizes:

If I take two similar languages (say Dutch and German) then why is German about twice the size at 123 MB?
Since the larger languages also appear to have larger associated native speaking populations (i.e. German, French and Japanese vs Dutch, Estonian) however this is not consistent. (Italian is small at 60 MB yet has a large population)
This isn't exactly the most important question ever asked, however I am curious to know what the differences would be.
