Proof Silver Eagles - Interesting Minting Pattern?

Intentional or not, the mint facility producing the proof silver eagles has taken on a interesting pattern.
The proof silver eagles were all minted at San Francisco during the Reagan/Bush years (1986-1992), Philadelphia during the Clinton years (1993-2000), and so far at West Point during the Bush II years (2001-2006).
Has anyone else noticed this? Coincidence? Or planned? Will we see a different mint produce the 2009 proof silver eagles, perhaps Denver? Kind of interesting I think.
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The name is LEE!
<< <i>Were different people running the Mint in those time frames? >>
Yes, several different I am certain.
<< <i>Intentional or not, the mint facility producing the proof silver eagles has taken on a interesting pattern.
The proof silver eagles were all minted at San Francisco during the Reagan/Bush years (1986-1992), Philadelphia during the Clinton years (1993-2000), and so far at West Point during the Bush II years (2001-2006).
Has anyone else noticed this? Coincidence? Or planned? Will we see a different mint produce the 2009 proof silver eagles, perhaps Denver? Kind of interesting I think. >>
Well, continuing this geographic progression, it is obvious that the 2009-2016 coins will be struck in Boston.
TD