https://tradingeconomics.com/sweden/the-real-gross-disposabl...
https://2.bp.blogspot.com/-tonEuOE0IXE/WfpBpIzy8rI/AAAAAAAAF...
If real disposable income is rising, then people have more access to non necessary resources than they did before. So, they have more wealth, but are having fewer babies, which is the general trend.