-99.7% is the change from 657 to 2
Calculation steps:
[( 2 - 657 ) ÷ 657] x 100 = -99.7%
Formula
Percentage change = [(2 - 657) / 657] x 100
Subtract the new number by the original number
2 - 657 = -655
-655 ÷ 657 = -0.9969558599695586
-0.9969558599695586 x 100 = -99.7%