-97.49% is the change from 678 to 17
Calculation steps:
[( 17 - 678 ) ÷ 678] x 100 = -97.49%
Formula
Percentage change = [(17 - 678) / 678] x 100
Subtract the new number by the original number
17 - 678 = -661
-661 ÷ 678 = -0.9749262536873157
-0.9749262536873157 x 100 = -97.49%