-53.05% is the change from 639 to 300
Calculation steps:
[( 300 - 639 ) ÷ 639] x 100 = -53.05%
Formula
Percentage change = [(300 - 639) / 639] x 100
Subtract the new number by the original number
300 - 639 = -339
-339 ÷ 639 = -0.5305164319248826
-0.5305164319248826 x 100 = -53.05%