Please read again:
Total number of new smartphone buyers. Total sales in Q4/2009: 54 million, total sales in Q4/2010: 101 million, difference: about 47 million.
Android sales in Q4/09: 5 million - in q4/10: 33 million. 33 million - 5 million: 28 million.
28 million out of 47 million: around 59%. Ok my rough estimate was off by 6%. Sorry for that.
I repeat: You need to learn how to read that chart. Total sales in Q42010 were 101.2 million. That doesn't mean total sales of all time, that means total sales in that one quarter. Android sales in that time period was 33 million, not 33 million minus 5 million.
What you're looking at is an overall market growth of 88% meaning nearly twice as many people bought smart phones during Q42010 as bought smart phones in the same quarter of 2009. Of that number, roughly 33% bought Android phones while the rest bought some other platform.
Understand now?