-64.05% is the change from 637 to 229
Calculation steps:
[( 229 - 637 ) ÷ 637] x 100 = -64.05%
Formula
Percentage change = [(229 - 637) / 637] x 100
Subtract the new number by the original number
229 - 637 = -408
-408 ÷ 637 = -0.640502354788069
-0.640502354788069 x 100 = -64.05%