-39.2% is the change from 199 to 121
Calculation steps:
[( 121 - 199 ) ÷ 199] x 100 = -39.2%
Formula
Percentage change = [(121 - 199) / 199] x 100
Subtract the new number by the original number
121 - 199 = -78
-78 ÷ 199 = -0.39195979899497485
-0.39195979899497485 x 100 = -39.2%