New York Sen. Kirsten Gillibrand became the first Democratic presidential candidate to release her latest tax returns on Wednesday, showing that she paid $29,170 in federal taxes last year or 13.4 percent of her total earned income.

Details from her returns show that Gillibrand earned just under $218,000 in 2018, with $167,634 coming from her Senate salary and $50,000 through a book deal.

The release of the returns also came with a challenge for her Democratic opponents to follow her lead.

"And now, as we fight to defeat Donald Trump, we need honesty, transparency and accountability more than ever," Gillibrand's campaign website says. "That's why Kirsten has posted her tax returns from the last 12 years here for all to see. And she's calling on every candidate in the Democratic field to follow her lead and release theirs, too."

Gillibrand's campaign website currently hosts 12 years of her tax returns, going back to 2007.

Only Massachusetts Sen. Elizabeth Warren has released a lengthy history of tax returns like Gillibrand, although she has not provided the public with her 2018 records.

Others like Sens. Kamala Harris of California and Cory Booker of New Jersey have given the press access to their returns during their Senate campaigns. Vermont Sen. Bernie Sanders promised last month during a CNN town hall event that he would release 10 years of his own returns but has not said when it would happen.

Former Texas Rep. Beto O'Rourke has never released any of his family's personal tax information.

[ Also read: Democrats to push forward on Trump tax return request]