Looking at the universe of stocks we cover at Dividend Channel, on 12/4/13, AllianceBernstein National Municipal Income Fund ( AFB) will trade ex-dividend, for its monthly dividend of $0.0729, payable on 12/20/13. As a percentage of AFB's recent stock price of $12.35, this dividend works out to approximately 0.59%, so look for shares of AllianceBernstein National Municipal Income Fund to trade 0.59% lower — all else being equal — when AFB shares open for trading on 12/4/13.Below is a dividend history chart for AFB, showing historical dividends prior to the most recent $0.0729 declared by AllianceBernstein National Municipal Income Fund: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from AFB is likely to continue, and whether the current estimated yield of 7.08% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of AFB shares, versus its 200 day moving average: Looking at the chart above, AFB's low point in its 52 week range is $11.87 per share, with $16.91 as the 52 week high point — that compares with a last trade of $12.35. According to the ETF Finder at ETF Channel, AFB makes up 1.08% of the CEF Municipal Income ETF ( XMPT) which is trading relatively unchanged on the day Monday. In Monday trading, AllianceBernstein National Municipal Income Fund shares are currently trading flat on the day.