lol, nice response. I won't do your work for you. Do a simple search of "shrinking middle class" or "middle class income" and you'll get more evidence than you can handle. Interestingly, the upper class is still rising somewhat. But the gap is widening, with the middle class dropping overall. Here's a nugget.
https://www.washingtonpost.com/news/wonk/wp/2016/05/11/the-middle-class-is-shrinking-just-about-everywhere-in-america/