-36.74% is the change from 509 to 322
Calculation steps:
[( 322 - 509 ) ÷ 509] x 100 = -36.74%
Formula
Percentage change = [(322 - 509) / 509] x 100
Subtract the new number by the original number
322 - 509 = -187
-187 ÷ 509 = -0.36738703339882123
-0.36738703339882123 x 100 = -36.74%