-6.77% is the change from 591 to 551
Calculation steps:
[( 551 - 591 ) ÷ 591] x 100 = -6.77%
Formula
Percentage change = [(551 - 591) / 591] x 100
Subtract the new number by the original number
551 - 591 = -40
-40 ÷ 591 = -0.0676818950930626
-0.0676818950930626 x 100 = -6.77%