1.21% is the change from 661 to 669
Calculation steps:
[( 669 - 661 ) ÷ 661] x 100 = 1.21%
Formula
Percentage change = [(669 - 661) / 661] x 100
Subtract the new number by the original number
669 - 661 = 8
8 ÷ 661 = 0.012102874432677761
0.012102874432677761 x 100 = 1.21%