The 2013 Forbes 400 list of the richest people in America was released today, and showed that the richest Americans increased their total net worth to $2.02 trillion this year. Microsoft founder Bill Gates topped the Forbes 400 for the 20th straight year.

The 2013 Forbes 400 List found that the 400 richest US citizens increased their combined net worth to $2.02 trillion this year, up $300 billion from 1.7 trillion in 2012, The Christian Science Monitor reports.  That's an all-time record, and, according to Forbes, is about the same as the gross domestic product of Russia.

The minimum net worth needed to make the Forbes 400 list was $1.3 billion, which is the highest figure since 2008, and kept 61 American billionaires off the list completely.

Only 30 members of the Forbes 400 saw their net worth fall over the past year; 314 members of the list saw their wealth grow, The Christian Science Monitor reports.

Microsoft founder Bill Gates was the richest person in America for the 20th straight year, with a net worth of $72 billion, according to the list

Twenty years ago, Gates took the title of the world's wealthiest man from Mexican tycoon Carlos Slim.

No. 2 on the list was, once again, Warren Buffet, chairman of Berkshire Hathaway. His net worth is listed at $58.5 billion, and he had the single-biggest dollar gain of anyone on the list - $12.5 billion, The Christian Science Monitor reports.

Oracle founder Larry Ellison was third with $41 billion, and the Koch brothers, Charles and David, tied for fourth.

Spots six through nine belonged to the Waltons, heirs to the Wal-Mart fortune.

New York City Mayor Michael Bloomberg rounded out the top 10.

Unfortunately, while the rich are getting richer, the income gap between the top 1 percent and the bottom 99 percent of US earners is the widest it's been in nearly a century, according to a study released last week, The Christian Science Monitor reports.

A joint analysis of Internal Revenue Service data by economists at University of California at Berkeley, the Paris School of Economics, and Oxford University found that the top 1 percent (defined as families making $394,00 or more in 2012) has grown its income 86.1 percent since 1993, while the 99 percent grew its income only 1.1 percent.