Correct me if I'm wrong at all.
See Nexus' and my exchange
By the year 2030, you say 67 million people will have it? From the current, what is it, like 46 million people today?
How am I supposed to take this fact seriously when you don't give me a percentage? A ratio of healthy to not healthy. Is that increasing, or is the population increasing and as a side effect that increases as well?
Say that five out of ten people in the year 1700 are cancerous. There are also only ten people alive. Say the population rises in one year by ten percent. So in 1710, somebody could go around saying "holystuffholystuff ten people have cancer as compared to the five people ten years ago!" but it's actually a meaningless statement because that's still 1:2 so it's note like it's any different.
It's the same thing here - give me a percentage so I know that the amount of people with arthritis isn't just increasing because the entire population is increasing. You seem to be trying to make it sound like a rising threat but if I'm right, and it's only increasing because the population is, it's not a rising threat at all.