Hi Matt

In your TCD

select your mesure then add this in the back ground color panel this expression :

ColorMix1( rank(total column(1))/noofrows(TOTAL) , lightgreen(),lightred())

You will get this

for talk :

ColorMix1( rank(total column(1))/noofrows(TOTAL) , lightgreen(),lightred())

for Pause :

ColorMix1( rank(total column(1))/noofrows(TOTAL) , lightred(),lightgreen())

For % conversation :

ColorMix1( rank(total column(1))/noofrows(TOTAL) , lightgreen(),lightred())

hope it helps