in Egypt you say
if you are talking to a man
"kol sana wenta tayeb"

to a woman
"kol sana wenty tayeba"

to a lot of people
"kol sana wentom tayebeen"

and you reply
to a man: "wenta tayeb"
to a woman: "wenty tayeba"
to a bunch of people: "wentom tayebeen"

:D

so kol sana wenty tayeba :)