Because wages are tied to supply and demand, not productivity. Increased productivity will rather lower wages.
> Yes, quite frequently. Here's an article with numbers and a graph
Same fallacy with the percentages: The top 1% clearly got their wages raised (CEOs etc), but in broader terms it doesn't matter much, because it's only 1%. In absolute terms, the sums are not that large relative to the sum of the wages of everyone else. It's a psychological problem, because people don't like income inequality, but economically, it doesn't make much of a difference. This is where the left steps in to gain political capital from a non-issue.