-78.63% is the change from 641 to 137
Calculation steps:
[( 137 - 641 ) ÷ 641] x 100 = -78.63%
Formula
Percentage change = [(137 - 641) / 641] x 100
Subtract the new number by the original number
137 - 641 = -504
-504 ÷ 641 = -0.7862714508580343
-0.7862714508580343 x 100 = -78.63%