-0.15% is the change from 662 to 661
Calculation steps:
[( 661 - 662 ) ÷ 662] x 100 = -0.15%
Formula
Percentage change = [(661 - 662) / 662] x 100
Subtract the new number by the original number
661 - 662 = -1
-1 ÷ 662 = -0.0015105740181268882
-0.0015105740181268882 x 100 = -0.15%