-17.87% is the change from 207 to 170
Calculation steps:
[( 170 - 207 ) ÷ 207] x 100 = -17.87%
Formula
Percentage change = [(170 - 207) / 207] x 100
Subtract the new number by the original number
170 - 207 = -37
-37 ÷ 207 = -0.178743961352657
-0.178743961352657 x 100 = -17.87%