4.09% is the change from 660 to 687
Calculation steps:
[( 687 - 660 ) ÷ 660] x 100 = 4.09%
Formula
Percentage change = [(687 - 660) / 660] x 100
Subtract the new number by the original number
687 - 660 = 27
27 ÷ 660 = 0.04090909090909091
0.04090909090909091 x 100 = 4.09%