-67.86% is the change from 644 to 207
Calculation steps:
[( 207 - 644 ) ÷ 644] x 100 = -67.86%
Formula
Percentage change = [(207 - 644) / 644] x 100
Subtract the new number by the original number
207 - 644 = -437
-437 ÷ 644 = -0.6785714285714286
-0.6785714285714286 x 100 = -67.86%