I'm not sure if this is possible architecturally, but when judging whether to set a bounty and how much it should be, it would be nice to see the impact based on our previous questions. If you're not visiting the site throughout the day, there is no way to tell how effective that bounty might be--particularly for increasing traffic. There is a similar question with adding and removing tags that increase the visibility in the right places, and the effect on views that may have.
Unfortunately we don't store this data over time, so aside from the view count from one data dump to the next, we have no more granular data available than that.
That's not to say we couldn't start storing this...but it wouldn't be good for the past, and it would be much more expensive (for not a lot of gain), since we handle quite a few views.
No. The views data is only stored as a simple counter. No historical data is kept, thus there is no way to present a graph of views over time.