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The ECB bought 3.08 billion euros ($3.70 billion) worth of credit last month, less than half the amounts purchased in each of the previous three months.
While the ECB also curbed its purchases of government bonds, the largest component of its stimulus programme, the reduction there was less marked.
In total, the ECB bought 50.2 billion euros worth of assets in December, a month when it normally reduces the pace of buying due to low trading volumes on financial markets around Christmas.