I would just add a couple of comments.
It is actually not straightforward to compare countries in terms of their “number of data sets”, because you could easily combine two data sets and say it was one. That's probably not a great metric. It is actually difficult to come up with a good metric for it. Certainly, you don't just want to count the amount of data that's out there. Ideally, you'd want to count the impact that data is having on the economy, which is a much more challenging thing to do. That being said, the Open Knowledge Foundation does have at least one benchmark and they try to compare countries. I wouldn't say I necessarily endorse it, but it's interesting to look at.
Finally, if you'd indulge me, I would go back to the privacy question. I think the approach taken in HIPAA versus at least one aspect of the Affordable Care Act in the U.S. does illustrate the difference between legislating the generation or control of data itself, which is HIPAA, versus the Affordable Care Act where you are not allowed to use data in order to discriminate about who is covered by insurance. That's basically the difference, whether or not you're allowed to have data at all or how you use it. I think that's a difference in the way you can legislate policy with regard to privacy.