Politbarometer 2021 (Cumulated Data Set)
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The Politbarometer has been conducted since 1977 on an almost monthly basis by the Research Group for Elections (Forschungsgruppe Wahlen) for the Second German Television (ZDF)....
政治晴雨调查（Politbarometer）自1977年起，由选举研究小组（Forschungsgruppe Wahlen）为德国第二电视台（ZDF）以近乎月度的频率持续开展……
