-15.34% is the change from 639 to 541
Calculation steps:
[( 541 - 639 ) ÷ 639] x 100 = -15.34%
Formula
Percentage change = [(541 - 639) / 639] x 100
Subtract the new number by the original number
541 - 639 = -98
-98 ÷ 639 = -0.15336463223787167
-0.15336463223787167 x 100 = -15.34%