The US$ Index should be revised imho. It's currently comprised of 6 currencies with 5 being in the Euro zone:
* Euro (EUR), 57.6% weight
* Pound sterling (GBP), 11.9% weight
* Canadian dollar (CAD), 9.1% weight
* Swedish krona (SEK), 4.2% weight and
* Swiss franc (CHF) 3.6% weight.
* Japanese Yen (JPY) 13.6% weight.
Nothing about the Aussie $ or emerging markets not to mention China. The US$ has just started showing strengt against New Zealand$ and Yen.