I looked at NGDP data in the past with the dynamic equilibrium model (see here , and here ), however the annual time series on GNP data at FRED goes back a bit further in time and includes the onset of the Great Depression. Here are the results, first using the housing and stock market "bubble" frame for 1990s-2000s, and then the "no knowledge" frame (discussed in ):
Here are the GNP growth rates:
It will be interesting to see which one is the better model. The latter suggests a potential "demographic" shift of e.g. baby boomers leaving the workforce over a ten year period centered around 2014.