Looking at the universe of stocks we cover at Dividend Channel, on 9/5/13, Tsakos Energy Navigation Ltd. ( TNP) will trade ex-dividend, for its quarterly dividend of $0.05, payable on 9/12/13. As a percentage of TNP's recent stock price of $4.65, this dividend works out to approximately 1.08%, so look for shares of Tsakos Energy Navigation Ltd. to trade 1.08% lower — all else being equal — when TNP shares open for trading on 9/5/13.Below is a dividend history chart for TNP, showing historical dividends prior to the most recent $0.05 declared by Tsakos Energy Navigation Ltd.: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from TNP is likely to continue, and whether the current estimated yield of 4.30% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of TNP shares, versus its 200 day moving average: Looking at the chart above, TNP's low point in its 52 week range is $3.04 per share, with $6.19 as the 52 week high point — that compares with a last trade of $4.64. According to the ETF Finder at ETF Channel, TNP makes up 4.13% of the Guggenheim Shipping ETF ( SEA) which is trading up by about 1.2% on the day Tuesday. In Tuesday trading, Tsakos Energy Navigation Ltd. shares are currently up about 0.7% on the day.