The disabled drivers and disabled passengers (tax concessions) scheme has evolved considerably since its inception in 1968. When the scheme was first introduced it provided only for exemption from road tax. Thereafter it was gradually extended to include repayment of excise duty on fuel, motor vehicle excise duty, VAT in 1972, and vehicle registration tax, which replaced motor vehicle excise duty, in 1993. At various times, conditions such as the need for vehicle adaptation have been modified. Prior to 1994, the various reliefs were administered by different areas within the Office of the Revenue Commissioners and I am advised that, for this reason, the information requested by the Deputy is readily available only for the years from 1994 onwards. The information is as follows: