As Cory Booker's national profile has risen, so has his income.

Newark Mayor Cory Booker (John Moore/Getty Images)

The Democratic mayor of Newark is now running for U.S. Senate in New Jersey. His campaign released 15 years of his tax returns Friday.

Booker made more than $400,000 from giving speeches in 2011, and nearly $350,000 last year.

Booker saw his income skyrocket from about $40,000 when he was a Newark city councilor in 1998 to $472,571 last year. 2011 was especially lucrative for him; he made more than $700,000.

Booker also has received hefty payouts from a law firm he helped found. He left the firm when he became mayor in 2006, and he has made $688,500 from it since.

The returns show Booker has few assets, and has made about $100,000 on stock sales.

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