-70.2% is the change from 641 to 191
Calculation steps:
[( 191 - 641 ) ÷ 641] x 100 = -70.2%
Formula
Percentage change = [(191 - 641) / 641] x 100
Subtract the new number by the original number
191 - 641 = -450
-450 ÷ 641 = -0.7020280811232449
-0.7020280811232449 x 100 = -70.2%