-99.7% is the change from 656 to 2
Calculation steps:
[( 2 - 656 ) ÷ 656] x 100 = -99.7%
Formula
Percentage change = [(2 - 656) / 656] x 100
Subtract the new number by the original number
2 - 656 = -654
-654 ÷ 656 = -0.9969512195121951
-0.9969512195121951 x 100 = -99.7%