-97.62% is the change from 671 to 16
Calculation steps:
[( 16 - 671 ) ÷ 671] x 100 = -97.62%
Formula
Percentage change = [(16 - 671) / 671] x 100
Subtract the new number by the original number
16 - 671 = -655
-655 ÷ 671 = -0.9761549925484352
-0.9761549925484352 x 100 = -97.62%