text: Delphis Hanover weekly municipal bond yields . Delphis Hanover weekly muni bond yields calculated Dec 5 Aaa Aa A Baa 1997 3.50 3.60* 3.70 3.75 4.00 4.00 4.30 4.35 2001 4.20 4.20 4.35 4.40 4.65 4.65 5.00 5.00 2006 4.70 4.70 4.85 4.85 5.15 5.15 5.50 5.50 2011 5.15 5.15 5.30 5.30 5.60 5.60 5.90 5.90 2016 5.35 5.30 5.50 5.45 5.80 5.75 6.10 6.05 2021 5.45 5.40 5.60 5.55 5.90 5.85 6.20 6.15 2026 5.50 5.45 5.65 5.60 5.95 5.90 6.25 6.20 *from previous calculation on Nov 27 -- U.S. Municipal Desk , 212-859-1650