3.41% is the change from 645 to 667
Calculation steps:
[( 667 - 645 ) ÷ 645] x 100 = 3.41%
Formula
Percentage change = [(667 - 645) / 645] x 100
Subtract the new number by the original number
667 - 645 = 22
22 ÷ 645 = 0.034108527131782945
0.034108527131782945 x 100 = 3.41%