Our constant U.S. dollar price series preserve the growth rates exhibited in the constant local price series. To produce constant price aggregates, we first convert each country's constant local price data into constant 2010 U.S. dollars, and then sum by year along with implicit gap-filling of missing values. Rescaling to a different base year would reflect different country weights in aggregations based on the values in the base year chosen but data for missing countries would need to be estimated. For example, you can rescale the 2010 data to 2005 by first creating an index dividing each year of the constant 2010 series by its 2005 value (thus, 2005 will equal 1). Then multiply each year's index result by the corresponding 2005 current U.S. dollar price value.