I have a line chart show problems in 2014 compared to problem of 2015. The line for 2014 is gold and the line for 2015 is blue. I want to make it fancy and set the label background color dependent on what year it represents. for example, light blue back for 2015 since the line is blue, and light yellow for 2014 since the line is gold. I see there is an expr for label background. Can someone point me in the right direction? Any help would be appreciated.
Thanks