2011:
soep-is-2011/Q187.12012:
soep-is-2012-haupt/Q2092013:
soep-is-2013-f/Q255 soep-is-2013-a/Q2552014:
soep-is-2014-a/Q245 soep-is-2014-f/Q2452015:
soep-is-2015/Q3092016:
soep-is-2016-f/Q393 soep-is-2016-a/Q3932017:
soep-is-2017-f/Q408
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