Donald Trump pulled off one of the biggest upsets in American political history when he toppled Hillary Clinton in the U.S. presidential election on Tuesday — and he did it using far less cash than his rival.

Relying heavily on an unorthodox mix of social media, unfiltered rhetoric and a knack for winning free TV time, the New York real estate businessman likely paid less than $5 per vote during his insurgent White House bid, about half what Clinton paid, according to a Reuters analysis of campaign finance records and voting data.

Those figures assume the candidates spent all the funds they raised.