Please find below the requested information.
2019-20 is the most recent year we have published data on the DES website for the requested information.
The figure for primary schools is the number of mainstream primary schools which have "All Subjects Through Irish" as their Irish Classification Description.
The figure for post-primary schools is the number of post-primary schools which have "All pupils taught all subjects through Irish" as their Irish Classification Description
This figures are collated from the relevant, Primary & Post Primary Data on Individual Schools, tables published on the DES website and can be found at the link below: