How long have American firms been in business visualized with pies and donuts

In September 2016, the US Census Bureau released data that showed how long American firms have been in business. The US Census Bureau even created a nice-looking visualization themselves (http://www.census.gov/newsroom/press-releases/2016/cb16-148.html) showing the results from that data:

In this section, we'll create an alternative visualization using an animated donut chart. While making this, we'll explore the following subjects:

• Learning how to use animations to occur when data is loaded
• Using the various path generators from D3 to generate SVG paths
• Using color interpolators to color each inpidual part of the donut

You can see this sample for yourself by opening example: <DVD3>/src/chapter-02/D02-01.html. The results look like this:

By selecting a different group of firm owners in the top left you can see the donut transition to its new state, and if you hover with the mouse over a donut segment, it'll grow a bit, and show its percentage in the middle of the donut.

First off, let's see what the data looks like in its raw form.