Sanitation — not the most interesting of topics, but nonetheless telling.
Anyone that has visited the Caucasus can tell you that trash is problematic. And anyone that has travelled outside of the capital cities can discuss outhouses / outdoor toliet facilities.
Taking into consideration that Armenia is the most urban of the three countries, it is not surprising that it also has the highest levle of trash removal and public sewage.
I’m not sure what happened in Azerbaijan in 2009. That’s a pretty big drop. There have been some subtle changes in the way that the Caucasus Barometer collects data that may have influences this.