-70.92% is the change from 643 to 187
Calculation steps:
[( 187 - 643 ) ÷ 643] x 100 = -70.92%
Formula
Percentage change = [(187 - 643) / 643] x 100
Subtract the new number by the original number
187 - 643 = -456
-456 ÷ 643 = -0.7091757387247278
-0.7091757387247278 x 100 = -70.92%