Google is your friend. 2006 would put it in the Bush years.
Actually, it was put in by rule in August of 2008. Still the Bush years, but not 2006.
This is a great example of unintendend consequences. They pushed the “recommendation” for Gardasil on the premise that many health insurance plans are required by law to cover vaccines, but only those which are “recommended”.
Now we find that, by adding it to the “recommended” list, it also forces the vaccine on those wishing to immigrate.
I bet that in 1996, those voting for this law had no idea there would be a vaccine that wasn’t necessary for the public good, but which would be “recommended”. Vaccines were for childhood diseases, not to make it easier to have sex without consequences.
1996 puts it in the clinton years.