-88.68% is the change from 645 to 73
Calculation steps:
[( 73 - 645 ) ÷ 645] x 100 = -88.68%
Formula
Percentage change = [(73 - 645) / 645] x 100
Subtract the new number by the original number
73 - 645 = -572
-572 ÷ 645 = -0.8868217054263566
-0.8868217054263566 x 100 = -88.68%