-17.98% is the change from 645 to 529
Calculation steps:
[( 529 - 645 ) ÷ 645] x 100 = -17.98%
Formula
Percentage change = [(529 - 645) / 645] x 100
Subtract the new number by the original number
529 - 645 = -116
-116 ÷ 645 = -0.17984496124031008
-0.17984496124031008 x 100 = -17.98%