Chances of landing a post doc (Banach Space Theory) and tenure track position? Currently I am a 2nd year PhD student in Nanyang Technological University, Singapore. My research interest lies in functional analysis, particularly Banach Space Theory.

I would like to know what are the chances to land a post doc in this field after my graduation and subsequently a tenure track position. If possible, I would like to have some statistical information to observe the trend.

I frequently visit (literally everyday) Mathjobs to get an overall idea on how many post doc positions available on analysis (no PDE, by the way). Unsurprisingly, it is not a lot. 

I know that it is extremely difficult to land a post doc nowadays due to oversupply of PhD graduates (I assume most PhD graduates would like to stay in academia). However, I do not want to stuck at working post doc and cannot rise to tenure track. I think this defeats the purpose of doing a post doc, as it is an intermediate step of obtaining a tenure track position. If this is case, then I think it would be better to work elsewhere straightaway after graduation.

EDIT: Geographically speaking, I prefer working in developed countries such as USA, UK, Korea, Japan, Singapore, Australia, etc.
Statistics won't help you here. Getting a job isn't a random selection process. Every candidate is different. Every position is different. The selection process is designed to match skills with requirements, even if it does so rather poorly. But on a purely statistical basis, assume that your chances are zero. 

If you want a job as a math prof, independent of sub-field, write a lot of good papers. Learn to be a good instructor. Get some experience in advising others, etc. Then look for jobs that seem to match your skills and background. Become known in your sub-field and in the larger world of mathematicians (attend conferences, say). Use your advisor(s) to meet people elsewhere through introductions. Do some collaborative work with people elsewhere. Assure that your advisors are extremely happy with you and with your work so that you get marvelous letters of recommendation. 

Expect that the process will be very competitive. You need to find a way to stand out from the crowd. When 200 applications arrive for any position you want to have yours wind up in the short (explore further) pile rather than the tall (no interest) pile.