-74.67% is the change from 991 to 251
Calculation steps:
[( 251 - 991 ) ÷ 991] x 100 = -74.67%
Formula
Percentage change = [(251 - 991) / 991] x 100
Subtract the new number by the original number
251 - 991 = -740
-740 ÷ 991 = -0.7467204843592331
-0.7467204843592331 x 100 = -74.67%