Table 3. Analysis of the tourism resources and number of reviews in different periods.

Category		Segment Types	2014–2015 (Period 1)			2016–2017 (Period 2)			2018–2019 (Period 3)			2020–2021 (Period 4)			Total
			att	rev	%	att	rev	%	att	rev	%	att	rev	%	att	rev	%
Natural Resources		Physiography	9	488	10.9	11	1699	14.0	13	1919	19.0	12	1685	17.2	13	5791	15.9
		Waters	9	411	9.2	23	1430	11.8	23	901	8.9	25	1331	13.6	30	4073	11.2
		Biological	2	4	0.1	4	22	0.2	5	25	0.2	4	26	0.3	6	77	0.2
		Subtotal	20	903	20.2	38	3151	26.0	41	2845	28.2	41	3042	31.1	49	9941	27.3
Humanistic Resources	With historical value	Historic sites	6	596	13.3	10	1273	10.5	11	656	6.5	8	652	6.7	12	3177	8.7
		Ancient villages and towns	9	268	6.0	15	750	6.2	14	329	3.3	16	280	2.9	18	1627	4.5
		Architecture and facilities	11	113	2.5	30	502	4.1	36	352	3.5	36	366	3.7	44	1333	3.7
		Religious sites	17	462	10.3	43	1374	11.3	47	1757	17.4	37	1980	20.2	58	5573	15.3
		Historic gardens	7	823	18.4	12	2312	19.1	12	1814	18.0	13	1967	20.1	13	6916	19.0
		Subtotal	50	2262	50.5	110	6211	51.3	120	4908	48.6	110	5245	53.6	145	18626	51.1
	Uncertain historical value	Cultural venues	2	32	0.7	5	108	0.9	9	66	0.7	14	100	1.0	14	306	0.8
		Modern gardens	0	0	0.0	2	39	0.3	4	34	0.3	4	26	0.3	4	99	0.3
		Theme park	1	178	4.0	1	684	5.6	1	650	6.4	1	293	3.0	1	1805	4.9
		Featured street	2	26	0.6	2	98	0.8	6	62	0.6	8	50	0.5	8	236	0.6
		Rural landscape	12	769	17.2	26	1353	11.2	24	616	6.1	29	486	5.0	35	3224	8.8
		Subtotal	17	1005	22.5	36	2282	18.8	44	1428	14.1	56	955	9.8	62	5670	15.5
	Human Activities		1	233	5.2	3	321	2.7	3	732	7.2	6	271	2.8	7	1557	4.3
Recreation and Tourism Resources			3	73	1.6	6	144	1.2	6	191	1.9	8	267	2.7	8	675	1.9
Total			91	4476	100.0	193	12109	100.0	214	10104	100.0	221	9780	100.0	271	36469	100.0

Note: Period 1 corresponds to comments from 1 January 2014 to 31 December 2015; Period 2 corresponds to comments from 1 January 2016 to 31 December 2017, etc.

Att: Number of attractions; Rev: Number of reviews.