The Natural Philosopher wrote:

I am a bit curuous as to where the data from the years 2010-2050 comes
from...

Roger suggested inverting the data from 1950 - 2005 and adding it on
from 2006, to give a mirror image of the datatset based about 2005.
The idea was to try to identify as soon as possible where any downturn
could be confirmed. The second tranche of graphs was that exercise.