9.64% is the change from 612 to 671
Calculation steps:
[( 671 - 612 ) ÷ 612] x 100 = 9.64%
Formula
Percentage change = [(671 - 612) / 612] x 100
Subtract the new number by the original number
671 - 612 = 59
59 ÷ 612 = 0.09640522875816994
0.09640522875816994 x 100 = 9.64%