It's more 'define the interval'. For Japan and Greece that's more a stagnation - population didn't grow or fell much in last 30 years. On a interval of 2-3 gene

It's more 'define the interval'. For Japan and Greece that's more a stagnation - population didn't grow or fell much in last 30 years. On a interval of 2-3 generation (20-60 years) most of countries show growth, not decline in population. Many times predicted population decline in Germany turns to be slow growth during last 30 years.