I love visualizations like this.
The Job Voyager is an interactive time series of occupations going back to 1850. Type an occupation in the search box to get a closer look at how it has changed over time, for example "economist":
(Hat tip: chart porn)
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If you like visualizations like this, check out Wattenberg's Baby Name Wizard. (Or check out my Q & A with Martin Wattenberg.)
