I'm looking for the lengths of the centromeres of human chromosomes. 

The best I could come up with so far has been: [The length of individual centromeric arrays was found to range from an average of 680 kilobases for the Y chromosome to 3000 kb for chromosome 11.][1]

[Here they say][2] that "Human centromeres are located at repetitive alpha satellite DNA arrays that compose approximately 5% of the genome." Which unfortunately is not the same as saying the centromeres compose 5% of the genome. (Or maybe it is? Biologists to the rescue!)

Ideally an answer would contain the length of the centromere in each chromosome, but a precise percentage for the whole human genome would be good enough. 


  [1]: http://www.pnas.org/content/86/23/9394.full.pdf
  [2]: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3966626/