-69.46% is the change from 645 to 197
Calculation steps:
[( 197 - 645 ) ÷ 645] x 100 = -69.46%
Formula
Percentage change = [(197 - 645) / 645] x 100
Subtract the new number by the original number
197 - 645 = -448
-448 ÷ 645 = -0.6945736434108527
-0.6945736434108527 x 100 = -69.46%