The Myanmar National Portal provides descriptions of the Ministries in Myanmar as well as links to their respective websites, many of which offer access to data/statistics pertaining to their relevant subject areas.
For a list of IGOs (intergovernmental organizations), please see Northwestern University's List of IGOs Research Guide. Many IGO websites will include a section for data and statistics or provide access to publications and reports containing data. NGO (non-governmental organization) websites also are great resources for finding statistics.
Use the NU A-Z Databases List to access subscription databases providing access to statistics. You can filter the list to include only those databases that pertain to statistics.