YK28: Gambia - 1977: 125k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/28-08-2015%2023-46-03%20PM.jpg)
YK29: Burundi - 1969: 70k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/29-08-2015%200-04-32%20AM.jpg)
YK30: Vatican - 1995: 145k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/29-08-2015%200-03-33%20AM.jpg)
YK31: Bảo vệ môi trường - Andorra - 1986: 105k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/28-08-2015%2018-32-46%20PM.jpg)
YK32: Bảo vệ môi trường - Đức - 1986: 35k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/28-08-2015%2018-34-10%20PM.jpg)
YK33: Bảo vệ môi trường - Thổ Nhĩ Kỳ - 1986: 290k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/28-08-2015%2017-04-48%20PM.jpg)
YK34: Bảo vệ môi trường - Iceland - 1986: 180k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/28-08-2015%2017-12-40%20PM.jpg)
YK35: Solomon Islands - 2015: 305k
![](http://i1225.photobucket.com/albums/ee386/zozo2612/0000013/28-08-2015%2018-40-15%20PM.jpg)
YK36: Solomon Islands - 2015: 355k