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maybe you're not using the same awk than i have (i've got a gnu version called gawk)
just try "rdrtx1 (https://www.unix.com/members/302126107.html)"'s solution it's more complete with a "sort"...

in case you need to add "%" and use float

awk '{ A[$2]++ } END { for(X in A) printf("%d\t%.2f%\n", X, (A[X]*100)/NR) }' inputfile