Ok so DefenderofTruth helped me a lot to find clues to the date of the talk, and it's 1983. Here's why:
"listen to the first minute, he says "if you have the 1975 yearbook at home", not 'this years' and he says 'if you have'. So this is a good few years on from 1975..
For the next clue (and to be honest the mentality displayed here in the talk seriously needs a thread of its own, if you ever get around to it, it is disgusting and dangerous, but anyway..), please listen to minutes 16-18, he talks about Cabrini Green in Chicago. Listen carefully, he mentions that 'a couple of years ago the mayor tried to go in and clean up the place', for publicity or to get reelected, words to that effect.. (aha, got it, I thought) .
A google search revealed that happened in 1981.. I will forward you the proof.."
"In March 1981, as an effort to demonstrate a commitment to making the complex safer, then-Chicago Mayor Jane Byrnemoved into a fourth-floor apartment in the 1160 N. Sedgwick building with her husband for three weeks. [ 11 ] [ 10 ]Backed by a number of police officers and a substantial personal bodyguard presence, she stayed for only three weeks, and this incident contributed to public perception of Cabrini–Green as the worst of the worst of public housing."
http://en.m.wikipedia.org/wiki/Cabrini%E2%80%93Green
THANK YOU SO VERY MUCH!!