-99.6% is the change from 251 to 1
Calculation steps:
[( 1 - 251 ) ÷ 251] x 100 = -99.6%
Formula
Percentage change = [(1 - 251) / 251] x 100
Subtract the new number by the original number
1 - 251 = -250
-250 ÷ 251 = -0.9960159362549801
-0.9960159362549801 x 100 = -99.6%