great chart... i have done extensive investigations into this as well.. long time ago..

you could really expand this chart if you like to do some work..

eg lining up all the yrs on a 10 by 10 chart.. 0 1 2 3 etc

by

1900

1910

1920

etc very big chart !!!!! i used 10 ft x 10 ft for good visual impact!

but what about the fact now its 2000

and 2010

2020

2030

could it be another 30 yrs till we get into 2040s?