-68.38% is the change from 661 to 209
Calculation steps:
[( 209 - 661 ) ÷ 661] x 100 = -68.38%
Formula
Percentage change = [(209 - 661) / 661] x 100
Subtract the new number by the original number
209 - 661 = -452
-452 ÷ 661 = -0.6838124054462935
-0.6838124054462935 x 100 = -68.38%