How to display my graph in terms of the grand total and not just the selected total

[BasRAsks]

Hi, 

I have an amount of data which has a column “Gevonden naam (found name)", these are unique instances of an answer given by someone. This data spans multiple years. 

I am trying to make a line chart where for each year it shows the percentage this "Gevonden naam (found name)" was found in total in relation to amount of rows there are for that specific year. 

Currently, my line graph keeps taking the horizontal grand total as the percentage, I want it to take the vertical grand total. 

So the blue line uses the grand total of itself, I want it to look at the amount of total names that exist in that year, and then calculate what percentage of that it is. 

Example of the data: 

It'd be great if anyone knows what to do. Let me know if I can clarify things.