Because
there's more home ownership per population & the mortgages are so high & take so long to pay off, plus it's Established so deeply now that both people share the Mortgage ( by how much a %-age per month from each of the separate one-of-the-two people , who knows ? ) ---------
------- I'd suggest more couples are learning to tolerate each other & stay together, as a factor in itself - not taking any children into consideration (?)
there's more home ownership per population & the mortgages are so high & take so long to pay off, plus it's Established so deeply now that both people share the Mortgage ( by how much a %-age per month from each of the separate one-of-the-two people , who knows ? ) ---------
------- I'd suggest more couples are learning to tolerate each other & stay together, as a factor in itself - not taking any children into consideration (?)