-29.8% is the change from 557 to 391
Calculation steps:
[( 391 - 557 ) ÷ 557] x 100 = -29.8%
Formula
Percentage change = [(391 - 557) / 557] x 100
Subtract the new number by the original number
391 - 557 = -166
-166 ÷ 557 = -0.2980251346499102
-0.2980251346499102 x 100 = -29.8%