-99.7% is the change from 669 to 2
Calculation steps:
[( 2 - 669 ) ÷ 669] x 100 = -99.7%
Formula
Percentage change = [(2 - 669) / 669] x 100
Subtract the new number by the original number
2 - 669 = -667
-667 ÷ 669 = -0.9970104633781763
-0.9970104633781763 x 100 = -99.7%