Table 2

Bootstrapping estimated efficiency (annual average and 95% CIs)

	TE					PTE					SE
Year	Estimated eff.	Bias corrected	Bias	Lower bound	Upper bound	Estimated eff.	Bias corrected	Bias	Lower bound	Upper bound	Bias corrected
2008	0.5911	0.4495	0.1416	0.4320	0.5799	0.6905	0.5659	0.1246	0.5430	0.6835	0.7036
2009	0.6397	0.4914	0.1483	0.4833	0.6278	0.7238	0.6048	0.1190	0.5779	0.7166	0.7266
2010	0.6261	0.4870	0.1391	0.4833	0.6144	0.7030	0.5941	0.1089	0.5682	0.6960	0.7548
2011	0.6706	0.5092	0.1614	0.4886	0.6583	0.7689	0.6322	0.1367	0.6088	0.7612	0.6906
2012	0.7671	0.5871	0.1800	0.5774	0.7527	0.8413	0.6915	0.1498	0.6668	0.8328	0.7149
2013	0.7176	0.5438	0.1738	0.5362	0.7036	0.8130	0.6876	0.1255	0.6534	0.8051	0.6970
2014	0.7137	0.5348	0.1789	0.5167	0.7005	0.8272	0.6851	0.1421	0.6573	0.8186	0.6687
Mean	0.6751	0.5147	0.1604	0.5025	0.6625	0.7668	0.6373	0.1295	0.6108	0.7591	0.7080

TE scores were calculated by authors using bootstrapping DEA_CRS (CCR model); PTE and SE scores were calculated by authors using bootstrapping DEA_VRS (BCC model).
PTE, pure technical efficiency; TE, technical efficiency.