51.71% is the change from 644 to 977
Calculation steps:
[( 977 - 644 ) ÷ 644] x 100 = 51.71%
Formula
Percentage change = [(977 - 644) / 644] x 100
Subtract the new number by the original number
977 - 644 = 333
333 ÷ 644 = 0.5170807453416149
0.5170807453416149 x 100 = 51.71%