-73.98% is the change from 661 to 172
Calculation steps:
[( 172 - 661 ) ÷ 661] x 100 = -73.98%
Formula
Percentage change = [(172 - 661) / 661] x 100
Subtract the new number by the original number
172 - 661 = -489
-489 ÷ 661 = -0.7397881996974282
-0.7397881996974282 x 100 = -73.98%