-97.58% is the change from 660 to 16
Calculation steps:
[( 16 - 660 ) ÷ 660] x 100 = -97.58%
Formula
Percentage change = [(16 - 660) / 660] x 100
Subtract the new number by the original number
16 - 660 = -644
-644 ÷ 660 = -0.9757575757575757
-0.9757575757575757 x 100 = -97.58%