-36.7% is the change from 643 to 407
Calculation steps:
[( 407 - 643 ) ÷ 643] x 100 = -36.7%
Formula
Percentage change = [(407 - 643) / 643] x 100
Subtract the new number by the original number
407 - 643 = -236
-236 ÷ 643 = -0.36702954898911355
-0.36702954898911355 x 100 = -36.7%