Table 2. Efficiency analysis results for each natural recreation forest before COVID-19 (2019).

Sortation(DMU)		Technical Efficiency(CCR)	Pure Technical Efficiency(BCC)	Scale Efficiency(SE)	Reference group	Returns to Scale	Output shortfall(Income)	Output shortfall(Visitor)
National		1	1	1	1	CRS	-	-
Public	Incheon	1	1	1	2	CRS	-	-
	Daejeon	0.3915	0.4329	0.9044	1,2,7	DRS	433,559	33,375
	Gyeonggi	0.6982	0.8853	0.7887	2,7,13	DRS	59,850	6,415
	Gangwon	0.7626	0.7751	0.9839	7,11,13	IRS	88,041	16,470
	Chungbuk	0.8749	0.8901	0.9829	2,7,13	DRS	50,259	27,142
	Chungnam	1	1	1	7	CRS	-	-
	Jeonbuk	1	1	1	8	CRS	-	-
	Jeonnam	0.6654	0.6713	0.9912	7,11,13	IRS	139,273	41,095
	Gyeongbuk	0.5983	0.5986	0.9995	2,7,13	DRS	178,071	48,519
	Gyeonnam	0.8479	1	0.8479	11	IRS	-	-
	Jeju	0.8814	0.8865	0.9942	1,2,7,13	DRS	54,308	8,996
Private		1	1	1	13	CRS	-	-
Geometric mean		0.825	0.857	0.961			77,182	14,001