Sim, o gráfico que eu esperava era exatamente assim como vc mostrou. Vc obteve esse gráfico com os mesmos dados que estou usando?
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São muitos dados; talvez por isso o gráfico tenha louqueado. Se bem que o gráfico deveria de qualquer forma funcionar.
Fiz teste com outro código com poucos códigos, veja no anexo que ficou como esperado.
Se for esse o problema, a solução será limitar os dados. Preciso pensar em como fazer isso.