I have been searching the net for about 2 hours now and cannot seem to find this information.
I am looking for the numbers on the 1999 GNP and what percentage of it is made up by the healthcare industry. Can anyone help me?

Look for Gross Domestic Product (GDP) not GNP. They’re not using GNP any more.

Best spot to find the info is probably the Bureau of Economic Analysis.

Try looking under info here

Alot of zip and CSV type files to download.