-19.18% is the change from 631 to 510
Calculation steps:
[( 510 - 631 ) ÷ 631] x 100 = -19.18%
Formula
Percentage change = [(510 - 631) / 631] x 100
Subtract the new number by the original number
510 - 631 = -121
-121 ÷ 631 = -0.19175911251980982
-0.19175911251980982 x 100 = -19.18%