-74.36% is the change from 663 to 170
Calculation steps:
[( 170 - 663 ) ÷ 663] x 100 = -74.36%
Formula
Percentage change = [(170 - 663) / 663] x 100
Subtract the new number by the original number
170 - 663 = -493
-493 ÷ 663 = -0.7435897435897436
-0.7435897435897436 x 100 = -74.36%