source
All data were collected from UN tables accessed at http://unstats.un.org/unsd/demographic/products/socind/
on April 23, 2012. OECD membership is from www.oecd.org, accessed
May 25, 2012.
The data file UN11a contains only the columns region,
subregion, Fertility,
PPgdp and lifeExpF for localities with all these variables observed.