53.73% is the change from 644 to 990
Calculation steps:
[( 990 - 644 ) ÷ 644] x 100 = 53.73%
Formula
Percentage change = [(990 - 644) / 644] x 100
Subtract the new number by the original number
990 - 644 = 346
346 ÷ 644 = 0.5372670807453416
0.5372670807453416 x 100 = 53.73%