Well on the 9L list I have, which admittedly is outdated and not the "certified"list, there there over 140 pilots on their list prior to 2006. XJ has about 470 and 9E has about 650. Percentage wise that works out to be about 30% of 9Ls list, 45% of XJs, and 51% of 9Es. Again these are approximate, and based off non-certified lists. There are at least 20 hired before 2000 on 9Ls list, so that would be senior to over 90% of those on the 9E list.