Looking at the universe of stocks we cover at Dividend Channel, on 5/9/13, Invesco Van Kampen Trust for Investment Grade Municipals ( VGM) will trade ex-dividend, for its monthly dividend of $0.083, payable on 5/31/13. As a percentage of VGM's recent stock price of $14.85, this dividend works out to approximately 0.56%, so look for shares of Invesco Van Kampen Trust for Investment Grade Municipals to trade 0.56% lower — all else being equal — when VGM shares open for trading on 5/9/13.Below is a dividend history chart for VGM, showing historical dividends prior to the most recent $0.083 declared by Invesco Van Kampen Trust for Investment Grade Municipals: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from VGM is likely to continue, and whether the current estimated yield of 6.71% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of VGM shares, versus its 200 day moving average: Looking at the chart above, VGM's low point in its 52 week range is $14.23 per share, with $16.37 as the 52 week high point — that compares with a last trade of $14.85. According to the ETF Finder at ETF Channel, VGM makes up 1.66% of the CEF Municipal Income ETF ( XMPT) which is trading up by about 1.4% on the day Tuesday. In Tuesday trading, Invesco Van Kampen Trust for Investment Grade Municipals shares are currently down about 0.1% on the day.