-10.05% is the change from 199 to 179
Calculation steps:
[( 179 - 199 ) ÷ 199] x 100 = -10.05%
Formula
Percentage change = [(179 - 199) / 199] x 100
Subtract the new number by the original number
179 - 199 = -20
-20 ÷ 199 = -0.10050251256281408
-0.10050251256281408 x 100 = -10.05%