I am advised by the Revenue Commissioners that a wide range of statistical information is available on the Commissioners' Statistics webpage: http://www.revenue.ie/en/about/statistics/index.html.
In relation to the Deputy's specific question, the latest information on the cost and numbers benefiting from tax relief under Section 848A of the Taxes Consolidation Act, 1997, which provides for a scheme of tax relief on donations to approved bodies including eligible charities, can be found at http://www.revenue.ie/en/about/statistics/costs-expenditures.html.
This table also provides information about the cost to the exchequer regarding the exemption of income of charities, colleges, hospitals, schools, friendly societies, etc.
The table contains the latest information which is available. For most reliefs, the latest full year for which information is available is 2013. Further updates will be published in due course.