(Bloomberg) -- Investors of exchange-traded funds that buy U.S. government debt are signaling that economic-growth optimism is taking root.

After pouring into the ETFs to start the year, investors pulled $10.3 billion in March, the biggest exodus since December 2010, data compiled by Bloomberg show. The $7.86 billion iShares 1-3 Year Treasury Bond ETF alone lost a third of its assets from withdrawals, the most of any fixed-income fund this month.

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