#	Flag	Country Name	Code	Visitors
1	🇰🇭	Cambodia Host	KH	64,471
2	🇸🇬	Singapore	SG	25,452
3	🇺🇸	United States	US	10,280
4	🇨🇳	China	CN	3,414
5	🇯🇵	Japan	JP	1,172
6	🇹🇭	Thailand	TH	877
7	🇮🇳	India	IN	872
8	🇩🇪	Germany	DE	596
9	🇦🇺	Australia	AU	501
10	🇬🇧	United Kingdom	GB	485
11	🇰🇷	South Korea	KR	447
12	🇫🇷	France	FR	436
13	🇨🇦	Canada	CA	426
14	🇭🇰	Hong Kong	HK	399
15	🇻🇳	Vietnam	VN	340
16	🇳🇱	Netherlands	NL	296
17	🇵🇭	Philippines	PH	295
18	🇷🇺	Russia	RU	233
19	🇮🇩	Indonesia	ID	225
20	🇮🇪	Ireland	IE	153
21	🇲🇾	Malaysia	MY	138
22	🇧🇷	Brazil	BR	128
23	🇫🇮	Finland	FI	121
24	🇨🇭	Switzerland	CH	118
25	🇵🇹	Portugal	PT	104
26	🇳🇬	NG	NG	88
27	🇵🇰	Pakistan	PK	86
28	🇵🇱	Poland	PL	84
29	🇰🇪	KE	KE	82
30	🇿🇦	South Africa	ZA	79
31	🇧🇪	Belgium	BE	75
32	🇸🇨	SC	SC	74
33	🇱🇦	Laos	LA	67
34	🇹🇷	Turkey	TR	61
35	🇪🇸	Spain	ES	53
36	🇦🇹	Austria	AT	52
37	🇧🇩	Bangladesh	BD	51
38	🇪🇹	ET	ET	48
39	🇹🇿	TZ	TZ	46
40	🇹🇼	Taiwan	TW	45

Standard Operating Procedure, NCHADS/ US CDC 2006