GDP Per Capita as a Fraction of US GDP Per Capita over Time

Below, Corrections depicts the GDP per capita as a fraction of US GDP per capita for a series of OECD countries (click to enlarge).  GDP per capita is in constant prices, PPP with 2005 as the basket reference year.  We exclude Luxembourg and Norway, the two countries that have higher values than the U.S. in these terms.  A few things stand out:

1. Korea's growth in the last decade has been astounding.  Far faster in per capita terms than China's.
2. China is exceedingly poor.
3. The Russian Federation is exceedingly poor.  
4. Ireland's "Celtic Tiger" growth is astounding, even taken with its catastrophic fall.