Subject: what is the average percentage of dna shared by unrelated individuals

first of all, i would like to state that im clear that humans share about 99.9% 
of their genetic material. i have a question about the 0.1% that tends to 
differ. siblings share about 50% of this 0.1%. how much would two unrelated 
individuals share on average? is phenotypic similarity between two unrelated 
individuals ever an indication of a higher degree of shared dna? 

Re: what is the average percentage of dna shared by unrelated individuals