How many 1st year grad students will get their Ph.D. in chemistry?

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A little evening tidbit: Dan Drezner is a professor of international political economy and a longtime foreign policy blogger. He's been involved in an interesting debate about whether or not a Ph.D. is required for going into policy in the Washington, D.C. area. He is pushing back strongly against any encouragement of a doctorate as a terminal degree. Here is a tibdit from his latest long post about it that I found stunning:

Furthermore, not finishing a Ph.D. is not exactly uncommon.  Click on this slide show about Ph.D. attrition rates from the Council of Graduate Schools, and note the following three facts: 

1)  Only 46% of all entrants finish their Ph.D. after seven years in a program.
2)  For social science Ph.D.s, that figure is even lower -- 41%
3)  If you extend it out to ten years, the lowest completion rate among the social sciences is political science -- only 44% complete a doctorate after a decade.  In other words, entering a Ph.D. program and then not finishing is the modal outcome. 

From that report (written in 2008, collected from data before then) the 10-year completion rate was 62% for a doctoral degree in chemistry. (I wonder what that number is now? To SESTAT!)