49.7% is the change from 664 to 994
Calculation steps:
[( 994 - 664 ) ÷ 664] x 100 = 49.7%
Formula
Percentage change = [(994 - 664) / 664] x 100
Subtract the new number by the original number
994 - 664 = 330
330 ÷ 664 = 0.49698795180722893
0.49698795180722893 x 100 = 49.7%