-74.28% is the change from 661 to 170
Calculation steps:
[( 170 - 661 ) ÷ 661] x 100 = -74.28%
Formula
Percentage change = [(170 - 661) / 661] x 100
Subtract the new number by the original number
170 - 661 = -491
-491 ÷ 661 = -0.7428139183055976
-0.7428139183055976 x 100 = -74.28%