Pivot Table References Sharepoint List - % True

[siemensslave]

Hi,
I have a pivot table that references a SharePoint list. In the sharepoint list, there are checkboxes which export to Excel as TRUE or FALSE depending on whether they are checked or not.

For a given pivot table column, I am trying to calculate the % of the data total that are displayed as TRUE. Ive looked under count - advanced options and cant seem to get it.

Heres a sample of the data:

Name Location Business Segment Basic Training Risk Management Training PM4 Training
Ratzki, Markus Mülheim Mods & Upgrades TRUE FALSE TRUE
Schmidt, Kai Mülheim Mods & Upgrades FALSE FALSE TRUE
Winkler, Andreas Mülheim Mods & Upgrades TRUE FALSE TRUE
Rialland, Nicolas Mülheim Mods & Upgrades TRUE FALSE TRUE
Gluschkowskij, Igor Mülheim Mods & Upgrades FALSE FALSE FALSE

Any ideas are much appreciated!!

Thanks,
Matt