-19.81% is the change from 212 to 170
Calculation steps:
[( 170 - 212 ) ÷ 212] x 100 = -19.81%
Formula
Percentage change = [(170 - 212) / 212] x 100
Subtract the new number by the original number
170 - 212 = -42
-42 ÷ 212 = -0.19811320754716982
-0.19811320754716982 x 100 = -19.81%