Year-to-date, the iShares Core US Aggregate Bond Fund (AGG) declined 6.2% and the Vanguard Total Bond Market ETF (BND) fell 6.3%. Over the past year, AGG fell 4.5% and BND dropped 4.5%. Global bond exchange traded funds are suffering one of their worst pullbacks since their peak last year as central banks around the world look to tighten monetary policies to keep inflation in check.