-19.02% is the change from 631 to 511
Calculation steps:
[( 511 - 631 ) ÷ 631] x 100 = -19.02%
Formula
Percentage change = [(511 - 631) / 631] x 100
Subtract the new number by the original number
511 - 631 = -120
-120 ÷ 631 = -0.1901743264659271
-0.1901743264659271 x 100 = -19.02%