-36.5% is the change from 663 to 421
Calculation steps:
[( 421 - 663 ) ÷ 663] x 100 = -36.5%
Formula
Percentage change = [(421 - 663) / 663] x 100
Subtract the new number by the original number
421 - 663 = -242
-242 ÷ 663 = -0.3650075414781297
-0.3650075414781297 x 100 = -36.5%