Form T-776, reporting co-ownership %

In form T-776, TurboTax is asking to enter partnership or co-ownership %. By default this is blank. Husband is working full-time (salaried) and wife is not employed (no income). the rental property is owned by both. Should there be any % mentioned in this cell? Can we assign 90% to wife & 10% to husband? or does it have to be 50% each? Do the expenses also have to be entered using the above % or just enter the total expenses and TurboTax will take care of the calculation? I noticed that if I enter the expenses for one of us it automatically shows the same amount for the other.