-70.39% is the change from 645 to 191
Calculation steps:
[( 191 - 645 ) ÷ 645] x 100 = -70.39%
Formula
Percentage change = [(191 - 645) / 645] x 100
Subtract the new number by the original number
191 - 645 = -454
-454 ÷ 645 = -0.703875968992248
-0.703875968992248 x 100 = -70.39%