It seem clear from the context that the writer(s) of this add meant (I hope) "annually," but accidentally put the word "anally." I don't know if this is an autocorrect error, or just poor proofreading, but the upshot is that this is not a problem that a spell-checker would catch since the word "anally" is spelled correctly.
The main takeaway from this is that it is extremely important to proofread one's writing before submitting it. On a blog like this the occasional error is no big deal as I can go back and change it almost instantly, but for large scale ad campaigns, or when turning in essays to professors, one must take extra care to make sure that one's writing says exactly what one means it to.
h/t to Jim Mahler