Help:German "Joke" - Status Every 20 years?

I'm trying to remember a joke/story told about a time traveller talking to a German in 1900(?). He tells the German about the status of Germany in 1920, (which is horrid) so the German guesses that things must be really bad in 1940, where upon the time traveller tells him, no Germany is in wonderful shape in 1940, where the German guesses they must be on top of the world in 1960 (and so on?). Anyone know where I can actually find this? (If someone thinks I'd have better luck on the chat board or ASB, let me know)
 
A version is in General Sir John Hackett's book. Either The Third World War, or the Untold Story. Can't remember which.

I think the dates were something like

1933 - how low Germany's fallen - led by a clinically insane dictator who goes on to murder 6 million Jews

1943 - how high - from Artic to North Africa, and from Atlantic to the Ukraine

1948 - how low - cities flattened, etc. etc.

1968 - how high - rich, colour TVs, etc., watch people travelling to the moon, etc.
 
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