Comprehensive Legend

Hello,

Ok so I have a viz that has many different doughnut charts that tell a manager how much money they have spent versus how much they have left.  Looks like this:

Because I have multiple funds, I have multiple doughnut charts.  The coloring of the doughnut charts is the same, regardless of the fund.

So if the difference is:

      1%-3% then green or "on target"

     4% - 10% then yellow or "near target"

     More than 10% then red or "outside of range"

What I want to do is to show a legend with all three colors.  For the sake of the argument - let's say there are no values greater than 10% so everyone is "on target" or "near target"

In other words what I want to show is this:

but with the absence of values greater than 10% i am only going to get this:

Any one have an idea on how I might be able to do this?

Thank you,

Scott