-41.38% is the change from 667 to 391
Calculation steps:
[( 391 - 667 ) ÷ 667] x 100 = -41.38%
Formula
Percentage change = [(391 - 667) / 667] x 100
Subtract the new number by the original number
391 - 667 = -276
-276 ÷ 667 = -0.41379310344827586
-0.41379310344827586 x 100 = -41.38%