-55.46% is the change from 687 to 306
Calculation steps:
[( 306 - 687 ) ÷ 687] x 100 = -55.46%
Formula
Percentage change = [(306 - 687) / 687] x 100
Subtract the new number by the original number
306 - 687 = -381
-381 ÷ 687 = -0.5545851528384279
-0.5545851528384279 x 100 = -55.46%