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End-of-year oil reserves grew by a double-digit percentage, and gas reserves rose comparably during 2010, posting the strongest, combined annual growth in the five-year period analyzed by Ernst & Young in its 2010 US E&P benchmark study. This compilation includes the 50 largest companies, based on 2010 end-of-year oil and gas reserve estimates. End-of-2010 oil reserves for the companies reviewed were up 11%, while gas reserves increased 12%. The latter number is the result of strong shale development.
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