3.09% is the change from 647 to 667
Calculation steps:
[( 667 - 647 ) ÷ 647] x 100 = 3.09%
Formula
Percentage change = [(667 - 647) / 647] x 100
Subtract the new number by the original number
667 - 647 = 20
20 ÷ 647 = 0.030911901081916538
0.030911901081916538 x 100 = 3.09%