Help in Groupings

Hi guys,

I have a table with 2 columns as per table below:

Country Count
-------------------
AUSTRIA--------- 1
BAHAMAS-------- 3
BARBADOS-------- 2
CANARY ISLANDS- 6
COLOMBIA-------- 9
GUATEMALA-------11
LUXEMBOURG----- 15
MACEDONIA------ 6
PAKISTAN-------- 8
RUSSIA----------- 13
TAIWAN---------- 3
KENYA----------- 5
ANDORRA-------- 15
BELGIUM--------- 1
CHILE----------- 3
CYPRUS--------- 6
FINLAND-------- 14

How can I count them by using these groupings 1-5,6-10,11-15? So I will have now a table like this:

Group Count
-------------
1-5----- 6
6-10---- 5
11-15--- 5

Please help.thanks