程阳：U.S. GAMING REVENUE 10-YEAR TRENDS

As the gaming industry has expanded throughout the United States, the gross annual revenue has steadily increased. Gross gambling revenue (GGR) is the amount wagered minus the winnings returned to players, a true measure of the economic value of gambling. GGR is the figure used to determine what a casino, racetrack, lottery or other gaming operation earns before taxes, salaries and other expenses are paid — the equivalent of "sales," not "profit." In 2004, for example, the commercial casino industry had GGR of more than $30 billion*, but paid over $12 billion in wages and benefits and more than $4.9 billion in taxes, plus other expenses.
The following chart shows the growth from 1997 to 2007 in both the commercial casino industry and gaming as a whole, which includes pari-mutuel wagering, lotteries, casinos, legal bookmaking, charitable gaming and bingo, Indian reservations and card rooms.

2006、2007年全球彩票销售

程阳：US and CAN lottery sales in FY08 

         Annual Nevada Gaming Abstract Reports