50.23% is the change from 665 to 999
Calculation steps:
[( 999 - 665 ) ÷ 665] x 100 = 50.23%
Formula
Percentage change = [(999 - 665) / 665] x 100
Subtract the new number by the original number
999 - 665 = 334
334 ÷ 665 = 0.5022556390977444
0.5022556390977444 x 100 = 50.23%