How likely is it to get Post natal depression?

According to this link, about 8% of new mothers will get post natal depression. http://sg.theasianparent.com/postnatal_depression_in_singapore/ There is a higher chance of getting post natal depression if you are in a stressful situation (i.e. conflicts with in-laws, moving house, financial difficulty) and/or you have a poor relationship with the baby's dad. https://www.nlm.nih.gov/medlineplus/ency/article/007215.htm