The U.S. Dollar index reaches 99

The U.S. Dollar Index (DXY) tracks the strength of the dollar against a basket of major currencies. 
DXY originally was developed by the U.S. Federal Reserve in 1973 to provide an external bilateral trade-weighted average value of the U.S. dollar against global currencies. U.S. Dollar Index goes up when the U.S. dollar gains "strength" (value), compared to other currencies.

The following six currencies are used to calculate the index:

• Euro (EUR) 57.6% weight
• Japanese yen (JPY) 13.6% 
• Pound sterling (GBP) 11.9% 
• Canadian dollar (CAD) 9.1% 
• Swedish krona (SEK) 4.2% 
• Swiss franc (CHF) 3.6% 

The DXY index topped at 103.82 in January 2017

 1 year

Japanese yen