“…It allows us to compute efficiency measures considering given outputs and a set of inputs. Although the number of academic works focusing on historical data using DEA is currently not as large as the number of works that use DEA to analyze more recent data, this approach has received increased attention even from those who are interested in researching data from the past (Enflo & Baten, 2007; Mourao, 2009; Nenovsky, Ivanov, & Mihaylova, 2008; Tankersley & Cuzan, 2004; Wheelock & Wilson, 1995).…”