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additional variance explained (SPSS)

I have a multiple regression y=a+b1+b2+b3+b4+b5. My Adj. R-sq is .403. I would like to determine how much explanation of variance each IV provides. I have created individual models (y=a+b1+b2+b3) to obtain "individual" Adj. R-sqs, but am not sure if it's permissible tosimply subtract one from the