TALLINN, Estonia — A center-right party that held the prime minister’s office in Estonia for over a decade won a general election Sunday, while a far-right populist party emerged as a big winner despite snubs from traditional power brokers.

Preliminary returns showed the opposition Reform Party receiving 28.8 percent of the vote, making it the top vote-getter. The party, which supports low taxes and minimal government involvement, held the premiership in Estonia from 2005 to 2016

The senior partner in the current coalition government, Prime Minister Juri Ratas’ Center Party, garnered 23.1 percent of the vote. The anti-immigration Estonian Conservative People’s Party, known as EKRE, came in third with 17.8 percent.

The rival Reform and Center parties, the two main political groupings since Estonia regained independence amid the collapse of the Soviet Union in 1991, shared an election goal of keeping EKRE from making inroads.