-9.3% is the change from 645 to 585
Calculation steps:
[( 585 - 645 ) ÷ 645] x 100 = -9.3%
Formula
Percentage change = [(585 - 645) / 645] x 100
Subtract the new number by the original number
585 - 645 = -60
-60 ÷ 645 = -0.09302325581395349
-0.09302325581395349 x 100 = -9.3%