[1] UNdata only has information available for the 'Estimate Variant' between 1950 and 2005. We have chosen to use the 'Medium Variant' for 2010 to 2050, as it is the most comparable variant available.
[2] The statistics quoted above are taken from the UNdata statistics database. UNdata quotes the original sources as being 'United Nations Population Division' (World Population Prospects: The 2008 Revision). UNdata is a statistical service provided by the United Nations. All data is available free of charge and may be copied freely, duplicated and further distributed, provided that UNdata is cited as the reference. The full UNdata re-publishing policy is here. This complete dataset was last updated by UNdata on June.18.2009 & last retrieved by BlatantWorld.com on September.12.2010. UNdata give the next update as April 2011, but these release dates can often be misleading.