-99.69% is the change from 647 to 2
Calculation steps:
[( 2 - 647 ) ÷ 647] x 100 = -99.69%
Formula
Percentage change = [(2 - 647) / 647] x 100
Subtract the new number by the original number
2 - 647 = -645
-645 ÷ 647 = -0.9969088098918083
-0.9969088098918083 x 100 = -99.69%