2012:
soep-is-2012-haupt/Q14601a2013:
soep-is-2013-f/Q177A2014:
soep-is-2014-f/Q164A2015:
soep-is-2015/Q2232016:
soep-is-2016-f/Q2072017:
soep-is-2017-f/Q251A2019:
soep-is-2019/Q2492020:
soep-is-2020/Q232
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