49.47% is the change from 663 to 991
Calculation steps:
[( 991 - 663 ) ÷ 663] x 100 = 49.47%
Formula
Percentage change = [(991 - 663) / 663] x 100
Subtract the new number by the original number
991 - 663 = 328
328 ÷ 663 = 0.4947209653092006
0.4947209653092006 x 100 = 49.47%