I am trying to create a line graph that for each month, counts the cumulative year % of "Correct", "Incorrect" and "Partial" elements.
I've created the expressions using aggr() but when they count 0 elements of one type, the cumulative value is not shown. I understand that it won't calculate anything if there aren't values during the year (it happens with "Incorrect" elements), but it should show values if the previous months had them ("Partial" elements).