Performance Review: IUSB Posts Modest Gains Over Past Year Over the past 12 months, the IUSB ETF has delivered a total return of 5.31%, outperforming its three- and five-year averages. The fund, with significant exposure to U.S. Treasuries, continues to offer a low expense ratio of 0.06%. Its yield stands at 5.25%, reflecting steady income for investors.34