-49.75% is the change from 197 to 99
Calculation steps:
[( 99 - 197 ) ÷ 197] x 100 = -49.75%
Formula
Percentage change = [(99 - 197) / 197] x 100
Subtract the new number by the original number
99 - 197 = -98
-98 ÷ 197 = -0.49746192893401014
-0.49746192893401014 x 100 = -49.75%