Is official data available on children with disabilities who are in compulsory education (normally primary and secondary schools)?

In detail

Only 13 percent of experts stated that data on children with disabilities in compulsory education are available in their country. The major issue several times mentioned is the fact that no data on out-of-school children is available (Antigua And Barbuda, Poland, Albania, United Kingdom, Zimbabwe, Italy,) and therefore no correct analysis on children with disabilities in compulsory education can be taken. Estimates suggest that 30 percent of all primary age children who are out of school are children with disabilities. (source: UNESCO (2008)).
Another problem is that often not all types of disabilities are covered in the data (Netherlands, Myanmar) and the statistics are not undertaken on a regular basis therefore data is outdated (Guatemala, Austria). 42 percent of respondents stated that not such data exists at all.