-36.88% is the change from 667 to 421
Calculation steps:
[( 421 - 667 ) ÷ 667] x 100 = -36.88%
Formula
Percentage change = [(421 - 667) / 667] x 100
Subtract the new number by the original number
421 - 667 = -246
-246 ÷ 667 = -0.36881559220389803
-0.36881559220389803 x 100 = -36.88%