2.63% is the change from 647 to 664
Calculation steps:
[( 664 - 647 ) ÷ 647] x 100 = 2.63%
Formula
Percentage change = [(664 - 647) / 647] x 100
Subtract the new number by the original number
664 - 647 = 17
17 ÷ 647 = 0.02627511591962906
0.02627511591962906 x 100 = 2.63%