These are the factors that I calculated from the US "Consumer Price Index" from a post I made over at JTAS.
OK I have found the consumer price index conversion factors.
To go from GT to CT multiply the GT price by .445
To go from CT to GT multiply the CT price by 2.248
To go from 2003 US $ to CT mulyiply the 2003 price by .33
To go from 2003 US $ to GT multiply the 2003 price by .741