The iShares Lehman 7-10 Year Treasury ETF (Amex: IEF) is sitting on a 10.3% total return for the 12 months through today’s close. That’s a healthy performance edge over the 1.9% rise in that stretch for the iShares Lehman 1-3 Year Treasury ETF (Amex: SHY). There’s nothing inherently peculiar about longer-term maturities outperforming shorter terms. Sometimes it happens, sometimes it doesn’t. But the fact that longer-term Treasuries are besting shorter ones is more than a little out of the ordinary after the Federal Reserve has hiked interest rates for nearly a year.