BOSTON — Like 16 other states in the nation, Massachusetts designates a percentage of gambling revenues generated at its casinos to support its flagging horse racing industry. Here's a snapshot of the Race Horse Development Fund as of July 18, 2015, the most recent data available:REVENUES:Casino license fees: $8.75 millionCasino gambling: $1.5 millionTotal revenues: $10.3 millionSPENDING:Harness racing: $420,000Thoroughbred racing: $1.3 millionTotal payments: $1.7 millionBALANCE:$8.6 million_______