-21.21% is the change from 198 to 156
Calculation steps:
[( 156 - 198 ) ÷ 198] x 100 = -21.21%
Formula
Percentage change = [(156 - 198) / 198] x 100
Subtract the new number by the original number
156 - 198 = -42
-42 ÷ 198 = -0.21212121212121213
-0.21212121212121213 x 100 = -21.21%