I am currently trying to make a split graduated/proportional symbol map on Classical music composers by country and musical era and I am having trouble with making the symbol in QGIS. I had to make a .csv table consisting of the totals by country and by era, and I am able to join my this table to a shape file of European countries, but the desired column (totals, representing the total composers of each country from the entire span of all musical eras) from the joined table I want to show represent with the graduated symbol does not show up in the drop down bar on either program.

I am able to get the split symbol using the pie graph feature on QGIS, but I still would like to be able to represent size changes of each pie graph showing the total composers from all eras.

I am currently trying to make a split graduated/proportional symbol map on Classical music composers by country and musical era and I am having trouble with making the symbol in QGIS. 

I had to make a .csv-table consisting of the totals by country and by era, and I am able to join my this table to a shape file of European countries, but the desired column (totals, representing the total composers of each country from the entire span of all musical eras) from the joined table I want to show represent with the graduated symbol does not show up in the drop down bar on either program.

I am able to get the split symbol using the pie graph feature on QGIS, but I still would like to be able to represent size changes of each pie graph showing the total composers from all eras.