Looking for data -- 2

I am looking for a freelancer who can help me gather highly detailed demographic data. Data needs to cover all countries or regions in the world.

Data Type:
- Demographic data related to language from the national census

Data Sources:
- Each country's National Bureau of Statistics website

Data Detail Level:
- Highly detailed

Ideal Skills and Experience:
- Experience in data gathering and analysis
- Familiarity with national government data sites
- Ability to present data in a clear and organized manner
- Attention to detail
- Strong research skills