BOSTON--(EON: Enhanced Online News)--Pioneer Investments today announced the declaration of dividends for five closed-end funds for December 2011. The closing market price, annualized market price distribution rate, NAV, and NAV distribution rate are based on data as of December 1, 2011. Pioneer Investments today is also announcing special one-time taxable distributions for Pioneer Municipal High Income Trust (MHI) and Pioneer Municipal High Income Advantage Trust (MAV). These taxable distributi
a style='font-size