-54.46% is the change from 639 to 291
Calculation steps:
[( 291 - 639 ) ÷ 639] x 100 = -54.46%
Formula
Percentage change = [(291 - 639) / 639] x 100
Subtract the new number by the original number
291 - 639 = -348
-348 ÷ 639 = -0.5446009389671361
-0.5446009389671361 x 100 = -54.46%