Nevada casinos reaped more than $1 billion in winnings in December, pushing the tally for 2019 past $12 billion in a key index of state fiscal health. The statewide “casino win” figure was up almost 5.8% compared with the same month in 2018, and the Nevada Gaming Control Board said Thursday that the first six months of the fiscal year have seen a 2.1% jump in casino winnings. Gambling tax revenue is second to sales taxes as a percentage of Nevada’s annual budget. The state has no personal income tax.