0.16% is the change from 645 to 646
Calculation steps:
[( 646 - 645 ) ÷ 645] x 100 = 0.16%
Formula
Percentage change = [(646 - 645) / 645] x 100
Subtract the new number by the original number
646 - 645 = 1
1 ÷ 645 = 0.0015503875968992248
0.0015503875968992248 x 100 = 0.16%