Variable		Frequency	%
Gender	Male	2462	0.5135
Gender	female	2333	0.4865
Age level	18 - 29	867	0.1808
	30 - 39	1298	0.2707
	40 - 49	1738	0.3625
	50 - 59	600	0.1251
	Over 60	292	0.0609
Years of study	9 and less	2219	0.4628
	10 - 12	1125	0.2346
	13 - 15	372	0.0776
	16 - 17	910	0.1898
	Over 18	169	0.0352
Sources of income	Farm	2155	0.4494
	Farm and sideline	562	0.1172
	Migration working	1371	0.2859
	Self-employment	700	0.146
	Livestock and aquaculture	240	0.0501
	Public employee	464	0.0968
	etc.	651	0.1358
Elder in family	Yes	3494	0.7287
Elder in family	No	1301	0.2713
Child in family	Yes	3724	0.7766
Child in family	No	1071	0.2234
Household Income (Chinese Yuan)	4000 and less	518	0.108
	[4000 - 6000)	438	0.0913
	[6000 - 8000)	358	0.0747
	[8000 - 10,000)	422	0.088
	[10,000 - 12,000)	394	0.0822
	[12,000 - 14,000)	207	0.0432
	[14,000 - 16,000)	352	0.0734
	[16,000 - 20,000)	396	0.0826
	[20,000 - 25,000)	303	0.0632
	[25,000 - 30,000)	258	0.0538
	Over 30000	1149	0.2396
Willingness to Pay	Yes	2851	0.5946
	No	1162	0.2423
	Not Sure	782	0.1631