-74.17% is the change from 666 to 172
Calculation steps:
[( 172 - 666 ) ÷ 666] x 100 = -74.17%
Formula
Percentage change = [(172 - 666) / 666] x 100
Subtract the new number by the original number
172 - 666 = -494
-494 ÷ 666 = -0.7417417417417418
-0.7417417417417418 x 100 = -74.17%