-6.2% is the change from 661 to 620
Calculation steps:
[( 620 - 661 ) ÷ 661] x 100 = -6.2%
Formula
Percentage change = [(620 - 661) / 661] x 100
Subtract the new number by the original number
620 - 661 = -41
-41 ÷ 661 = -0.06202723146747353
-0.06202723146747353 x 100 = -6.2%