19.88% is the change from 684 to 820
Calculation steps:
[( 820 - 684 ) ÷ 684] x 100 = 19.88%
Formula
Percentage change = [(820 - 684) / 684] x 100
Subtract the new number by the original number
820 - 684 = 136
136 ÷ 684 = 0.19883040935672514
0.19883040935672514 x 100 = 19.88%