-19.43% is the change from 211 to 170
Calculation steps:
[( 170 - 211 ) ÷ 211] x 100 = -19.43%
Formula
Percentage change = [(170 - 211) / 211] x 100
Subtract the new number by the original number
170 - 211 = -41
-41 ÷ 211 = -0.1943127962085308
-0.1943127962085308 x 100 = -19.43%