-66.93% is the change from 623 to 206
Calculation steps:
[( 206 - 623 ) ÷ 623] x 100 = -66.93%
Formula
Percentage change = [(206 - 623) / 623] x 100
Subtract the new number by the original number
206 - 623 = -417
-417 ÷ 623 = -0.6693418940609952
-0.6693418940609952 x 100 = -66.93%