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This figure, from a \href{http://physicsworld.com/cws/article/indepth/2012/oct/04/the-academic-pyramid}{Physics World article: The academic pyramid}, shows that over half of PhD graduates in science leave academia right away, with only 3.5\% eventually pursuing a research or teaching career in academia. While the graphic seems to be based on recent post-PhD science careers in the UK (data from the Higher Education Funding Council for England), it is probably generalizable to other countries. Overall, what I find surprising is that so little Ph.D. graduates actually stay in academia. I have lived, until now, with under  the impression (biased, (wrong,  apparently) that every Ph.D. will want and attempt a tenure track. But to think that only 1 in 200 graduates will become a professor sounds more like a lottery! While the figure above might be based on limited data and might not apply well to all academic fields, the takeaway point here is that \textbf{leaving academia after a Ph.D. or a Postdoc is totally normal}. It is not only a recent phenomenon, as I assumed. The \href{http://jakevdp.github.io/blog/2013/10/26/big-data-brain-drain}{Big Data brain drain} (highly recommended read) has always existed, in some way. Only it wasn't called "Big Data" because there was no "Data Science fever". Academia has historically lost some of its best computational scientists to the industry.