-2.17% is the change from 644 to 630
Calculation steps:
[( 630 - 644 ) ÷ 644] x 100 = -2.17%
Formula
Percentage change = [(630 - 644) / 644] x 100
Subtract the new number by the original number
630 - 644 = -14
-14 ÷ 644 = -0.021739130434782608
-0.021739130434782608 x 100 = -2.17%