Reserves held in US dollars fell to $6.62 trillion, or 61.69 percent of allocated reserves, in the fourth quarter, from $6.63 trillion, or 61.94 percent, in the third quarter.

The euro's share of global allocated currency reserves rose to 20.69 pct in the fourth quarter of 2018 to the largest since the fourth quarter of 2014.

The Chinese yuan's share of allocated reserves rose to 1.89 percent, the highest since the IMF began reporting its share of central bank holdings in the fourth quarter of 2016.