19.66% is the change from 534 to 639
Calculation steps:
[( 639 - 534 ) ÷ 534] x 100 = 19.66%
Formula
Percentage change = [(639 - 534) / 534] x 100
Subtract the new number by the original number
639 - 534 = 105
105 ÷ 534 = 0.19662921348314608
0.19662921348314608 x 100 = 19.66%