How do they determine the amount refunded on an injured spouse claim if my spouse has no income?

My spouse an I file injured spouse because I am not liable for his debt. In previous years we've both had income, but this last hear I was the only one working. How do they split injured spouse claims when the other spouse has no income?
I should also add that we have children that we get earned income credits, I'm not sure how that's taken into the equation.

Other answer:

Part of it is by income, but there are the personal exemptions, etc to consider.
Max Hoopla:
In that case you have not been injured.