The USCCB released survey results of the 2014 class of ordinands (from Latin, ordinandi, or “men to be ordained”). HERE
82% were altar boys
73% attended adoration of the Blessed Sacrament regularly
Suggestion to parish priests… heck… let’s include bishops, too:
If you want to foster vocations to the priesthood in your parishes, have all male service in the sanctuary, at the altar, and have regular exposition and benediction of the Blessed Sacrament.
Meanwhile, remember our polls here, sometime back?