The Trust’s share of oil and gas produced, all of which is from royalty interests, was as follows for the years ended December 31, 2013 2012 and 2011, respectively: oil (in barrels) – 217,682, 135,561, and 128,170, and gas (in thousands of cubic feet) – 1,065,458, 721,560 and 572,506. Reserves related to the Trust’s royalty interests are not presented because the information is unavailable.