turkey outperformed the US dollar by 35 percent over the course of 2015 , according to a study against the trillion dollar index , a basket of major economies . The second best performing currency relative to the index was the Israeli sheckel .
Bitcoin outperformed the US dollar by 35% over the course of 2015, according to a comparison against the US dollar index, a basket of major currencies. The second best performing currency relative to the index was the Israeli sheckel.