Corpora: Studies about proportion of words in languages ?

[Marcelo Sztrum]

Dear list members,

Are there, do you know comparative and/or quantified studies about the
proportion/ratio of words (words in writing corpora) of one language(s) to
another(s) (i.e.: *** For every X (1000??) Spanish/English words, there is
Y (about 700????) German words, etc.***)?

Thank you for your reactions. Regards,

Marcelo Sztrum
Paris