Table 3. Efficiency analysis results for each natural recreation forest after COVID-19 (2020).

Sortation(DMU)		Technical Efficiency(CCR)	Pure Technical Efficiency(BCC)	Scale Efficiency(SE)	Reference group	Returns to Scale	Output shortfall(Income)	Output shortfall(Visitor)
National		0.679	0.7998	0.849	12,13	DRS	60,254	39,773
Public	Incheon	0.3786	0.4523	0.8371	6,12,13	DRS	179,482	98,333
	Daejeon	0.2564	0.2675	0.9585	6,11	DRS	153,734	27,569
	Gyeonggi	0.7047	0.8683	0.8116	12,13	DRS	41,436	61,735
	Gangwon	0.7026	0.9059	0.7756	12,13	DRS	20,678	19,739
	Chungbuk	1	1	1	6	CRS	-	-
	Chungnam	1	1	1	7	CRS	-	-
	Jeonbuk	0.9817	1	0.9817	8	IRS	-	-
	Jeonnam	0.6079	0.6113	0.9944	6,11,13	IRS	77,303	12,080
	Gyeongbuk	0.7641	0.7721	0.9896	8,11,12,13	IRS	46,689	9,851
	Gyeonnam	1	1	1	11	CRS	-	-
	Jeju	1	1	1	12	CRS	-	-
Private		1	1	1	13	CRS	-	-
Geometric mean		0.775	0.821	0.938			44,583	20,698