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From what I remember:
70's was in the positive
80's - not so good, but mostly in the + column
90's - very good, but not as good as the 70's
early 2000 - good
Lately - not as good, still mostly in the + column.
Do not take this as fact, I am regurgitating from memory.
I saw a few instances of decline, but I never saw an average decline, everything I saw was an average (albeit minimal) growth.
__________________
"Life is a jest and all things show it
I thought so once, but now I know it"
John Gay
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