In their 2012 survey, GfK found 89% agree with the statement: "The Nazis killed millions of Jews".
Though 5% agreed with this statement: "The killing of millions of Jews by the Nazis is historically not proven".
6% were "undecided".
The trend over time:
In 1979 there were 15% who agreed with the 2nd statement, so it seems to be going down but stagnating lately at about 5%.
Today, 13% of "workers" agree with the 2nd statement, while 97% of those with at least a high school or university degree agree with the 1st statement.
72% agree that "it should be talked about and there should be research about the Nazi-killings, so that is doesn't happen again".
Especially the younger people (15-29 years old) and those who currently go to school or study, agree with 87% and 92%.
On the other hand, 26% think that "it's better if nothing is said about it anymore and it should be considered over and done with".
Especially workers (39%), middle-aged people (34%) and people from Carinthia/Styria (31%) agree with this.
74% of Austrians polled think that Austria was jointly responsible with Germany in the killings of Jews.
16% say that the "Germans alone" are to blame for the killings of Jews by the Nazis.
Again, 10% are "undecided".
And also like above, younger people and those in education/study or with high school or university degrees agree much more with the 1st than the 2nd statement.
http://www.gfk.at/public_relations/pressreleases/articles/010593/index.de.html...
I think you cannot be "undecided" about this, so you should factor in a big majority of those into the Holocaust-denier-segment as well. So, basically 11% of the population.