-99.71% is the change from 680 to 2
Calculation steps:
[( 2 - 680 ) ÷ 680] x 100 = -99.71%
Formula
Percentage change = [(2 - 680) / 680] x 100
Subtract the new number by the original number
2 - 680 = -678
-678 ÷ 680 = -0.9970588235294118
-0.9970588235294118 x 100 = -99.71%