-2.84% is the change from 669 to 650
Calculation steps:
[( 650 - 669 ) ÷ 669] x 100 = -2.84%
Formula
Percentage change = [(650 - 669) / 669] x 100
Subtract the new number by the original number
650 - 669 = -19
-19 ÷ 669 = -0.028400597907324365
-0.028400597907324365 x 100 = -2.84%