DOVER, DE (AP) – Delaware officials say competition from casinos in neighboring states continues to squeeze revenues at Delaware’s three casinos. Combined slot machine revenue for Delaware’s casinos was about $637 million in 2006, when the first Pennsylvania casino opened. It has declined every year since. Last year, Delaware slot machine revenue was $375 million and it is down nearly 10% for the first six months of 2014. Table games began in Delaware midway through 2010 and brought in $63.5 million in the first full year. But the number fell to $51.3 million last year and is down another 15.4% so far this year. Also, Delaware residents under age 18 soon will no longer be able to use tanning beds.Gov. Jack Markell signed into law a bill passed this year by the Delaware General Assembly. The law takes effect Jan. 1. Currently, those ages 14 to 18 can use tanning beds with parental permission.