-9.98% is the change from 611 to 550
Calculation steps:
[( 550 - 611 ) ÷ 611] x 100 = -9.98%
Formula
Percentage change = [(550 - 611) / 611] x 100
Subtract the new number by the original number
550 - 611 = -61
-61 ÷ 611 = -0.09983633387888707
-0.09983633387888707 x 100 = -9.98%