-69.35% is the change from 646 to 198
Calculation steps:
[( 198 - 646 ) ÷ 646] x 100 = -69.35%
Formula
Percentage change = [(198 - 646) / 646] x 100
Subtract the new number by the original number
198 - 646 = -448
-448 ÷ 646 = -0.6934984520123839
-0.6934984520123839 x 100 = -69.35%