U.S. Real Effective Exchange Rate

I've collected data on trade, exchange rates, and inflation.  Now I can finally make a U.S. real effective exchange rate.  This has been on my data bucket list for 2 full years.  A small insight is that CAD/USD is by far the largest contributor to this rate.  I thought China would have been, but I was wrong.  Now that I have the infrastructure set up, I may add a few other exchange rate series.  Perhaps one weighted by foreign central bank holdings of U.S. Treasuries or something of that nature.   I want to capture exchange rate risks to investments as well as the general economy.