Bruce, " . . . assuming the USD and EUR were about the same
in 2006 (where can you find historical data?) . . ."
Do a search. For example:
http://www.oanda.com/currency/historical-rates
"fxHistory is the easiest tool to access the largest foreign exchange
database on the Internet. To obtain the historical exchange rate for
any currency pair, select the language, the range of dates and the
currencies you would like to obtain exchange rates for."
Chris N