Year End Closing Trail Balance

Hi All

I want to know one thing, as today when i close the year i found one thing in the trail balance.e.g. i want to close the the year 2011, i generate the trail balance before closing, say, for one account its opening is4413, its debit is 727150, its credit is -730478 and its closing is 1085. now when i run the closing and generating the trail balance for the same year 2011, the figures got change and only the opening balance is same (its opening is4413, its debit is 92670380.07, its credit is -92825302.07 and its closing is -150509)

And when i generate the trail for the 2012, the opening is 1085, which is correct before closing.

Can you explain me what exactly happens in the closing. And if i want to keep the trail balance of the closed year as it was before, what i have to do.

thanks