-61.66% is the change from 639 to 245
Calculation steps:
[( 245 - 639 ) ÷ 639] x 100 = -61.66%
Formula
Percentage change = [(245 - 639) / 639] x 100
Subtract the new number by the original number
245 - 639 = -394
-394 ÷ 639 = -0.6165884194053208
-0.6165884194053208 x 100 = -61.66%