50.3% is the change from 664 to 998
Calculation steps:
[( 998 - 664 ) ÷ 664] x 100 = 50.3%
Formula
Percentage change = [(998 - 664) / 664] x 100
Subtract the new number by the original number
998 - 664 = 334
334 ÷ 664 = 0.5030120481927711
0.5030120481927711 x 100 = 50.3%