Democratic presidential candidate Hillary Rodham Clinton and her husband, former President Bill Clinton, on Friday reported total income approaching $140 million over the last eight years, providing evidence of the vast wealth they have accumulated.

The records showed that in 2013, the Clinton duo delivered six-figure speeches that reaped nearly $23 million.

Clinton, the front-runner in next year's race for the Democratic presidential nomination, released her family's tax returns from 2007 to 2014.