On 12/30/13, Vanguard Natural Resource LLC's 7.875% Series A Cumulative Redeemable Perpetual Preferred Units (VNRAP) will trade ex-dividend, for its monthly dividend of $0.1641, payable on 1/15/14. As a percentage of VNRAP's recent share price of $25.99, this dividend works out to approximately 0.63%, so look for shares of VNRAP to trade 0.63% lower — all else being equal — when VNRAP shares open for trading on 12/30/13. On an annualized basis, the current yield is approximately 7.58%, which compares to an average yield of 5.86% in the "Energy" preferred stock category, according to Preferred Stock Channel.As of last close, VNRAP was trading at a 3.96% premium to its liquidation preference amount, versus the average premium of 3.50% in the "Energy" category. The chart below shows the one year performance of VNRAP shares, versus VNR: Below is a dividend history chart for VNRAP, showing historical dividends prior to the most recent $0.1641 on Vanguard Natural Resource LLC's 7.875% Series A Cumulative Redeemable Perpetual Preferred Units: According to the ETF Finder at ETF Channel, Vanguard Natural Resource LLC ( VNR) makes up 8.99% of the Junior MLP ETF (MLPJ) which is trading up by about 0.5% on the day Thursday. In Thursday trading, Vanguard Natural Resource LLC's 7.875% Series A Cumulative Redeemable Perpetual Preferred Units ( VNRAP) is currently trading flat on the day, while the common shares ( VNR) are down about 0.5%.