-69.67% is the change from 643 to 195
Calculation steps:
[( 195 - 643 ) ÷ 643] x 100 = -69.67%
Formula
Percentage change = [(195 - 643) / 643] x 100
Subtract the new number by the original number
195 - 643 = -448
-448 ÷ 643 = -0.6967340590979783
-0.6967340590979783 x 100 = -69.67%