-46.01% is the change from 639 to 345
Calculation steps:
[( 345 - 639 ) ÷ 639] x 100 = -46.01%
Formula
Percentage change = [(345 - 639) / 639] x 100
Subtract the new number by the original number
345 - 639 = -294
-294 ÷ 639 = -0.460093896713615
-0.460093896713615 x 100 = -46.01%