-0.6% is the change from 666 to 662
Calculation steps:
[( 662 - 666 ) ÷ 666] x 100 = -0.6%
Formula
Percentage change = [(662 - 666) / 666] x 100
Subtract the new number by the original number
662 - 666 = -4
-4 ÷ 666 = -0.006006006006006006
-0.006006006006006006 x 100 = -0.6%