-2.4% is the change from 666 to 650
Calculation steps:
[( 650 - 666 ) ÷ 666] x 100 = -2.4%
Formula
Percentage change = [(650 - 666) / 666] x 100
Subtract the new number by the original number
650 - 666 = -16
-16 ÷ 666 = -0.024024024024024024
-0.024024024024024024 x 100 = -2.4%