-53.42% is the change from 687 to 320
Calculation steps:
[( 320 - 687 ) ÷ 687] x 100 = -53.42%
Formula
Percentage change = [(320 - 687) / 687] x 100
Subtract the new number by the original number
320 - 687 = -367
-367 ÷ 687 = -0.5342066957787481
-0.5342066957787481 x 100 = -53.42%