The Penn World Table 8.x provides information on relative levels of income, output, inputs, and productivity for 167 countries between 1950 and 2011.
Changes in Version 8.1-1
o Updated documentation after R package "pwt9" was released for PWT 9.0.
Changes in Version 8.1-0
o Update for PWT 8.1 (originally released in April 2015). It is an updated version of PWT 8.0, covering the same countries and period.
Changes in Version 8.0-0
o New package pwt8 for PWT 8.x. So far only PWT 8.0 has been released (in July 2013) and has been added as pwt8.0.