-99.71% is the change from 686 to 2
Calculation steps:
[( 2 - 686 ) ÷ 686] x 100 = -99.71%
Formula
Percentage change = [(2 - 686) / 686] x 100
Subtract the new number by the original number
2 - 686 = -684
-684 ÷ 686 = -0.9970845481049563
-0.9970845481049563 x 100 = -99.71%