-36.43% is the change from 991 to 630
Calculation steps:
[( 630 - 991 ) ÷ 991] x 100 = -36.43%
Formula
Percentage change = [(630 - 991) / 991] x 100
Subtract the new number by the original number
630 - 991 = -361
-361 ÷ 991 = -0.36427850655903127
-0.36427850655903127 x 100 = -36.43%