-15.15% is the change from 198 to 168
Calculation steps:
[( 168 - 198 ) ÷ 198] x 100 = -15.15%
Formula
Percentage change = [(168 - 198) / 198] x 100
Subtract the new number by the original number
168 - 198 = -30
-30 ÷ 198 = -0.15151515151515152
-0.15151515151515152 x 100 = -15.15%