-57.8% is the change from 609 to 257
Calculation steps:
[( 257 - 609 ) ÷ 609] x 100 = -57.8%
Formula
Percentage change = [(257 - 609) / 609] x 100
Subtract the new number by the original number
257 - 609 = -352
-352 ÷ 609 = -0.5779967159277504
-0.5779967159277504 x 100 = -57.8%