Societies within different countries have different levels of development, which is directly related to the size of their economic activity. When a country has the necessary resources, it paves the way for the improvement of medical services and education. The latter is key in the change of attitude regarding marriage among the population of this country.
After both the "Baby Boomer" generation and "Generation X", came the "Millenials" since the beginning of the '90s. Millennials tend to focus on the development of one's self. They constantly search for new experiences and tend to postpone events like marriage as much as they can. This, together with the current state of the economy and world affairs, has made people reluctant to have many children if they want any at all.