Circular sketch patterns

When you define a circular sketch pattern, one way is to specify the number of repetitions and the angle between each. Does anyone know how to pick this angle up from an angular dimension that exists on the sketch. For example if you want 15 degrees between each repetiton and an angular dimension of 15 is defined somewhere , is there a way to use that angular dimension so that if it changes, the angle between each pattern updates accordingly.

SolidworksSketching