It would be interesting to me because I feel it's something that has become pretty stark over the last few seasons, so if the figures over 10 years evened themselves out it would be evidence to me that there has been a shift at some point and would back up what many of us have been saying.I think it's interesting indeed. However, I'd want to see how it pans out over a larger time-frame. Can you provide us these stats over the last ten years for instance? If it turns out that there are similar stats than over the time-frame you mentioned, then you're definitely up to something.
I wanted to compare the big 6 over the last 3 years or so and have already looked at Chelsea, Spurs and City and their results show they have had more pens and gained more points as well.
I'll have a good look later and compare it over the 10 years and see how it pans out.