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Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet) -- MarkWest Energy Partners (NYSE: MWE) hit a new 52-week high Monday as it is currently trading at $67.89, above its previous 52-week high of $67.69 with 15,639 shares traded as of 9:36 a.m. ET. Average volume has been 692,600 shares over the past 30 days. MarkWest Energy has a market cap of $8.62 billion and is part of the basic materials sector and energy industry. Shares are up 32.1% year to date as of the close of trading on Friday. Markwest Energy Partners, L.P., together with its subsidiaries, engages in the gathering, processing, and transportation of natural gas the United States. The company has a P/E ratio of 46.2, above the S&P 500 P/E ratio of 17.7.