Turn off the legend and add a table. You will be able to format that any way you want and get the columns to line up with right-aligned numerical values. This will be much more readable.
Planned Downtime 14.3%, 58 hours
Unplanned Downtime 35.3, 118 hours
Up Time 50.4%, 135 hours
versus
Planned Downtime 14.3% 58 hours
Unplanned Downtime 35.3% 118 hours
Up Time 50.4% 135 hours
(Why is your screen grab 90% white space?)