What is the percentage of Bachelor or higher degree holder that finish calculus 3?
The Conference Board on the Mathematical Sciences (CBMS) is an umbrella organization representing the main mathematical sciences professional societies in the US.  They've done a series of surveys of undergraduate mathematics programs that include numbers of enrollments in courses at various levels.  The most recent published survey was from 2010.  

See 
 http://www.ams.org/profession/data/cbms-survey/cbms2010-Report.pdf

and the summary in chapter 1 of 
  http://www.maa.org/sites/default/files/pdf/cspcc/InsightsandRecommendations.pdf

Sadly, I don't see specific data on Calculus III enrollments.  

However, there are about 300,000 students per year enrolling in mainstream Calculus I in the fall semester.  A smaller number start in the spring or summer.  Many of those students won't make it through Calculus I and II, much less enroll in Calculus III (at many institutions only a few STEM disciplines require Calculus III while other STEM disciplines and non STEM disciplines don't require it), and not all of these students will go on to complete bachelor's degrees.  

So I'd be surprised if more than about 100,000 students per year graduated having successfully completed Calculus III.  

For comparison, about 1.8 million students per year completed bachelor's degrees in the comparable time frame of 2010-2011.  Thus the percentage is small (likely less than 5%.)