-22.05% is the change from 644 to 502
Calculation steps:
[( 502 - 644 ) ÷ 644] x 100 = -22.05%
Formula
Percentage change = [(502 - 644) / 644] x 100
Subtract the new number by the original number
502 - 644 = -142
-142 ÷ 644 = -0.2204968944099379
-0.2204968944099379 x 100 = -22.05%