-45.7% is the change from 639 to 347
Calculation steps:
[( 347 - 639 ) ÷ 639] x 100 = -45.7%
Formula
Percentage change = [(347 - 639) / 639] x 100
Subtract the new number by the original number
347 - 639 = -292
-292 ÷ 639 = -0.4569640062597809
-0.4569640062597809 x 100 = -45.7%