Amr bin Shu'ayb narrates from his father, from his grandfather (may Allah be pleased with him), that he (peace and blessings be upon him) "used to fix the diyah for accidental killing upon the town-dwellers at 400 dinars or its equivalent in silver, valuing it according to the prices of camels. If the price rose he would raise it, and if it fell he would lower it. In the time of the Messenger of Allah the value reached from 400 dinars to 800 dinars, or its equivalent in silver, that is, up to 8 thousand. And the Messenger of Allah (peace and blessings be upon him) ruled 200 cows upon the owners of cattle and 2000 goats upon the owners of goats."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16170