This graph is revealing for three reasons:
1) the most obvious is that Gross Domestic Product (GDP) has so much fluff built in it that it is never a good gauge of the economic reality it is meant to measure. Energy demand is a much better measure, at least within consistent technological paradigms.
2) it shows that China's economy in recent years has leaped far ahead of all Western economies in what actually matters: the production of tangible, usable goods and services that contribute to global humanity's well being and progress
3) it points up that Western economies have been stagnant in reality, clearly demonstrated by the fact that the current generation of Americans, Europeans and Japanese et. al. are worse off economically and cultural than their parents' generation. 
