The statistics on (permanent) disability pensions are maintained by the Federation of Social Insurances. They refer to all pensions due to reduced capacity to work or permanent disability paid out in December of a reporting year and to new early retirements in the year in question.
Detailed data on (permanent) disability pensions can be found on the website of the Federation of Social Insurances (in German only). Further information on pensions in general and on pensions of women and men (gender statistics) is available on the website of Statistics Austria.