Final answer:
Without the specific graph, it's conjecture based on context, but Zimbabwe's economic challenges and political turmoil suggest it may have changed the least in attitudes towards domestic violence against women.
Step-by-step explanation:
Unfortunately, the provided information does not include a specific graph that shows changes in women's beliefs about justification for domestic violence in the mentioned countries. To determine which country has changed the least, one would typically need data from a graph plotting these changes over time for each country. However, from the information given, we can infer that Zimbabwe has faced significant challenges related to economic decline, political turmoil, and civil unrest which could contribute to stagnation or limited change in social attitudes towards domestic violence. It is important to note that without the exact graph data, this is conjecture based on the current status and history of the nations mentioned.