The price of Smifnoff has dropped over the last 20 years. Why has inflation not touched alcohol?

I notice no one really talks about this one but since most of us probably had a drink or two last night I figured it was a good time to bring it up. 20 years ago when I was buying booze in college a fifth of Smirmoff was $15, a fifth of Absolute was $20, a handle of Jager was $40, and a case of Bud was $20. Fast forward to today and those prices are either the same or lower. I think this is being done on purpose to help keep us suppressed. It's way cheaper to be an alcoholic than it is to eat healthy these days. Any thoughts?