-17.91% is the change from 67 to 55
Calculation steps:
[( 55 - 67 ) ÷ 67] x 100 = -17.91%
Formula
Percentage change = [(55 - 67) / 67] x 100
Subtract the new number by the original number
55 - 67 = -12
-12 ÷ 67 = -0.1791044776119403
-0.1791044776119403 x 100 = -17.91%