0.18% is the change from 550 to 551
Calculation steps:
[( 551 - 550 ) ÷ 550] x 100 = 0.18%
Formula
Percentage change = [(551 - 550) / 550] x 100
Subtract the new number by the original number
551 - 550 = 1
1 ÷ 550 = 0.0018181818181818182
0.0018181818181818182 x 100 = 0.18%