Essentially I have two different datasets that I'm trying to consolidate. One set of data comes from the World Bank Databank, and is a set of historical GDP PPP values for all countries expressed in 2011 international \$. The other dataset is a set of forecasted GDP values for all countries, and is expressed in GDP PPP expressed in 2005 international $. I would like to convert one of these sets into the same units as the other.
Is this possible? If so, how would I do this?
The latter dataset has some historical values, so I've tried dividing the 2011\$ by the 2005$ for different countries, but have found that the ratio is different in all cases.
China - GDP 2008 in \$2005: 7,566.755billion; GDP 2005 in \$2011: 10,437.906billion - Ratio: 1.38
Canada - GDP 2008 in \$2005: 1,197.757billion; GDP 2005 in $2011: 1,383.398billion - Ratio: 1.15