ONLY ONE SAFE HAVEN:

The proportion of dollars in global foreign-exchange holdings has risen to its highest level in six years, cementing the greenback's role in the center of the financial system.

Central banks held 62.9% of their reserves in dollars at the end of the fourth quarter, up from 62.3% in the third quarter and marking the highest level since 2009, according to data released Tuesday by the International Monetary Fund. The share held in euros fell to 22.2%, the lowest allocation in 13 years.

The figures show how central banks have ceased efforts to diversify their foreign-exchange reserves away from the dollar amid a plunge in the value of the euro. Because central banks with their large reserves wield unrivaled influence in currency markets, their shift back toward the dollar gives many investors confidence in the greenback's rally.

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