Nevada’s unemployment leapt nearly a percentage point from July to August, rising from 12.5 percent to 13.2 percent. It’s the latest in a string of record joblessness rates the Silver State has posted in 2009. … Unemployment in Las Vegas increased from 13.1 percent to 13.4 percent in the same period. … That’s well above the national August average of 9.7 percent, and it’s nearly triple the 5.2 percent rate the state had in December 2007, as the national recession was beginning.