Saving Marco's data to a text file that is read and transformed by a few lines of R yields a nice table with relative usage percentages (taking out the 'all' non-binary architecture) as well as a cumulative sum of relative usage:
edd@chibud:/tmp> R --slave < it.feb.R
files.downloaded percent cumulpct
i386 1762483 96.6123 96.6123
powerpc 34420 1.8868 98.4991
ia64 18224 0.9990 99.4980
hppa 5985 0.3281 99.8261
sparc 1293 0.0709 99.8970
m68k 987 0.0541 99.9511
alpha 824 0.0452 99.9963
arm 45 0.0025 99.9987
mips 14 0.0008 99.9995
mipsel 6 0.0003 99.9998
s390 3 0.0002 100.0000
total 1824284 100.0000 NA
In other words, the top seven architectures cover 99.996 percent of downloads whereas the remaining four combined are a relatively scant 0.004 percent, or about one in twenty five thousand.