-47.73% is the change from 639 to 334
Calculation steps:
[( 334 - 639 ) ÷ 639] x 100 = -47.73%
Formula
Percentage change = [(334 - 639) / 639] x 100
Subtract the new number by the original number
334 - 639 = -305
-305 ÷ 639 = -0.47730829420970267
-0.47730829420970267 x 100 = -47.73%