-79.1% is the change from 641 to 134
Calculation steps:
[( 134 - 641 ) ÷ 641] x 100 = -79.1%
Formula
Percentage change = [(134 - 641) / 641] x 100
Subtract the new number by the original number
134 - 641 = -507
-507 ÷ 641 = -0.7909516380655226
-0.7909516380655226 x 100 = -79.1%