"You tell me why it was done."
Maybe because it saved Exxon/Mobil some MONEY??? Are you aware that many companies do it for the same reason? Do you understand economics?
I know that it did not save much, if any money.
I still must assume you work in the Exxonmobil HQ in Irving. Asking you what's going on in Exxon is like asking an islamic what's going on in the mosque.
How are those guatamalan accoutants working out?