Could you use the Line bar chart plugin, and i think you should be able to reach your goal here.
Here is one example that could help: Cumulative Chart of Users over time [Solved] - #4 by anthonycollias
Could you use the Line bar chart plugin, and i think you should be able to reach your goal here.
Here is one example that could help: Cumulative Chart of Users over time [Solved] - #4 by anthonycollias