-45.54% is the change from 639 to 348
Calculation steps:
[( 348 - 639 ) ÷ 639] x 100 = -45.54%
Formula
Percentage change = [(348 - 639) / 639] x 100
Subtract the new number by the original number
348 - 639 = -291
-291 ÷ 639 = -0.45539906103286387
-0.45539906103286387 x 100 = -45.54%