-38.72% is the change from 687 to 421
Calculation steps:
[( 421 - 687 ) ÷ 687] x 100 = -38.72%
Formula
Percentage change = [(421 - 687) / 687] x 100
Subtract the new number by the original number
421 - 687 = -266
-266 ÷ 687 = -0.38719068413391555
-0.38719068413391555 x 100 = -38.72%