-66.45% is the change from 623 to 209
Calculation steps:
[( 209 - 623 ) ÷ 623] x 100 = -66.45%
Formula
Percentage change = [(209 - 623) / 623] x 100
Subtract the new number by the original number
209 - 623 = -414
-414 ÷ 623 = -0.6645264847512039
-0.6645264847512039 x 100 = -66.45%