There’s perhaps no better symbolic representation of America’s financial might than the U.S. dollar. And right now, the world’s top currency is taking a big, mighty punch.

The dollar has slumped more than 10% this year, posting its worst decline in the first six months of a year since 1973, back when President Nixon shocked the world by detaching the dollar’s value from gold.

The decline reverses a long stretch of annual gains for the dollar — and it’s especially confounding given that the U.S. economy is still doing well.