What years of banknotes are the most in your collection?

With Numista, I notice a trend I would not have noticed before. Here's a look at my collection by year of note.

I cropped off the year scale at 1900 since there were few in my collection prior to this date. Does anyone else have a pattern of the banknotes in your collection?  Mine certainly does revolving around three events.  

The breakup of the Soviet Union & it's satellite countries. MANY “new” countries with Yugoslavia, Czechoslovakia & USSR break up.

WWII

WWI

I’ve got quite a few from the breakup of communist and socialist countries, 1942 with Japanese Occupation money, the RSFSR (1917-24), and a lot of recent pieces