Need to work out the percentage right for only positive counts

The Pivot is showing two positve numbers and 2 negative. The sum of positive numbers is 4 and the sum of negative numbers is 2. My percentage calculation is coming up as 33% but it needs to be 67%. Cannot figure out how to change this formula to only count the positive sums.

Formula used is=IFERROR(COUNTIF(S6:S50,">=1")/SUM(T6:T50),"NO DATA")
Columns S is the Positive/Negative data
Column T is the sum of Col S positive / negative numbers

First Col is S, Second is T. I need to have a formula which will end up say 4/6 to give me the % KPI but only using the positive numbers from Col S. If I add in -1 at the end it gives me -67%, not 67%.
5 2
-144 1
-237 1
8 2