-66.88% is the change from 631 to 209
Calculation steps:
[( 209 - 631 ) ÷ 631] x 100 = -66.88%
Formula
Percentage change = [(209 - 631) / 631] x 100
Subtract the new number by the original number
209 - 631 = -422
-422 ÷ 631 = -0.6687797147385103
-0.6687797147385103 x 100 = -66.88%