Okay, you'll need to use the var axis like this:

In the measures axis, your syntax would be something like this:

pctin(B3@{var}c1,1)
pctin(B3@{var}c2,1)
pctin(B3@{var}c3,1)
pctin(B3@{var}c4,1)
pctin(B3@{var}c5,1)
...

In the var axis, your syntax would be:

r1 
r2 
r3 
r4 
...