show year % difference of the year high and low

[EddieM]

I am trying to add a show year % difference of the year high and low. Then I want to do a month version as well.

I added in the def % = % ( period = aggregationperiod.Year); but that is nor working.
I have the difference of high and low showing but I also want it to show as a % up for the year.

How can I get the % of year high low difference working?

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declare upper;

def yH = high(period = aggregationperiod.Year);
def yL = low( period = aggregationperiod.Year);
def % = % ( period = aggregationperiod.Year);


def diff = yH - yL - %;

AddLabel(yes, "Year H L Diff " + diff, Color.LIGHT_GREEN);