Enterprise Surveys - available in alphabetical order (by country, then by date) here. You can read a brief overview of how the Enterprise Survey works here.
They are also available on the Country Profiles on the World Bank website, among other data. To access the surveys, go to the profile of the country. Click on More Data in the Country at a Glance section. On the next page, under Browse, click on Surveys. This will bring you to the section of the page where the Enterprise Survey is located, if there is one available for that country (you may need to also click on Most Recent Surveys to see all available surveys for that country).