thnaks for posting this. i've been in congregations that were super strict with KMs, but really the amount they get is determined by publishers + unbaptized publishers, so they are limited. but they've never been available publicly like this before, only authorized jw.org accounts could download them (often just MS/elders)
goes back to 2010 http://wol.jw.org/en/wol/lv/r1/lp-e/0/20283
EDIT
wow they're freely available on the website now as PDFs too http://www.jw.org/en/publications/kingdom-ministry/ , this is a big change in policy.