Build report to show Top 10 brands and MyBrand

I have a Sales Fact table that contains information on

Brand,Country, Sales

The Brand column has different brands A,B,C,D,E, etc... and MyBrand.  

Country could be Malaysia, Vietnam, Indonesia, Thailand, Cambodia

MyBrand is sold in all the countires.

What I need is to bild a report that shows the Top 5 Brands and My Brand along with the ranking. When No country is selected, ranking will be for all the rows. When filtered by Country it should be ranked for Sales within the country.

Sample output entire table

Brand       Sales  Rank

A              5000    1

F               3800    2

E               2400    3

L               1200    4

M              1000    5

MyBrand     700  10

Sample output when Malaysia is filtered in the slicer

Brand       Sales  Rank

K                800    1

F                 750    2

X                675    3

P               670      4

M              620      5

MyBrand     250  35

Notice the Rank for MyBrand changes also with respect to Malaysia.

Appreciate help from the forum.

Cheers

CheenuSing