The monthly number of asylum seekers arriving in Germany declined by two-thirds in March to about 21,000 as measures to stem the influx, including a European Union agreement with Turkey, kicked in, Interior Minister Thomas de Maiziere said.

Even so, the number of people applying for asylum in Germany in the first quarter more than doubled from the same period in 2015, increasing to 181,405 from 85,394, the ministry said in a statement Friday. De Maiziere said it’s too early to make a full-year forecast, after about 1 million refugees arrived in 2015.

“The measures we have taken are working” and “we can’t let up in our efforts” to stem the influx, he told a news conference in Berlin. The biggest number of asylum seekers are Syrians, followed by Iraqis and Afghans, according to the data.

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