[Vigilanteman]

There is a great tool available at Oanda.com. Just graph the currencies and roll over the week or day with your cursor. I found the tough for the following years at the following weeks:

1. 2012: March 19
   
2. 2011: April 11
   
3. 2010: April 12
   
4. 2009: April 6

Remarkable consistency here though, of course, it can't foretell the long term trends. But it does track the predictable seasonal consistency of selling foreign currency to buy yen to dress up balance sheets and pay taxes.

[stuartcr]

That’s usually what we use for our expenses