Dear Cassandra,

a few links:

http://www.sustainabletable.org/859/industrial-livestock-production

http://www.huffingtonpost.com/nil-zacharias/its-time-to-end-factory-f_b_1018840.html

https://farmforward.com/ending-factory-farming/

https://en.wikipedia.org/wiki/Intensive_animal_farming

however we have to verify the numbers!

best regards

Johannes

You may find the following site useful for European data.  However, the data here do not distinctly identify ‘free range’ or ‘naturally’ raised livestock.  It provides data for ‘organically’ raised livestock (under the sub topic 1.4).

http://ec.europa.eu/eurostat/statistics-explained/index.php/Organic_farming_statistics#Organic_livestock

For other countries, FAO Statistical Year book ( http://www.fao.org/3/a-i3620e.pdf) may have some useful data.