Check out this survey from the Chronicle of Philanthropy:  https://www.philanthropy.com/article/Fundraiser-Pay-Salaries-by/241454?cid=pt&utm_source=pt&utm_medium=en&elqTrackId=e2a10ea9f9074f5d8200e8cc3ae55004&elq=930cf877a4a649c383fb68a2733da8d2&elqaid=16091&elqat=1&elqCampaignId=6944