INDIANAPOLIS (AP) _ The federal government says Indiana’s suicide rate among its middle-aged population surged nearly 54 percent from 1999 to 2010, giving the state one of the nation’s biggest such increases.
 
  Thursday’s report from the Centers for Disease Control and Prevention shows Indiana’s suicide rate increase among people ages 35 to 64 was nearly twice the national increase of 28 percent.
 
  The CDC report’s 11-year time-frame includes the recession and the mortgage crisis, yet it doesn’t indicate what may have driven the increases in middle-aged people taking their own lives.
 
  But researcher Thomas Simon with the CDC’s Injury Prevention Center says some of the possible factors behind the increases could include the baby boomer generation’s historically higher suicide rate, the impact of the recession and increasing substance abuse.