What happened to other nine? (Lk 17:17-17:17)

“Then Jesus asked.

‘Were not ten

Made clean?

But the other nine,

Where are they?’”

 

ἀποκριθεὶς δὲ ὁ Ἰησοῦς εἶπεν Οὐχ οἱ δέκα ἐκαθαρίσθησαν; οἱ δὲ ἐννέα ποῦ;

 

Only Luke has this story about the curing of the ten lepers.  Luke indicated that Jesus asked this one leper (ἀποκριθεὶς δὲ ὁ Ἰησοῦς εἶπεν), where the other 9 lepers were (οἱ δὲ ἐννέα ποῦ), since 10 were made clean (Οὐχ οἱ δέκα ἐκαθαρίσθησαν).  Luke remarked that Jesus wondered about the other 9 lepers.  How come only one, or 10%, of the 10 cured lepers showed up to give thanks?  Would you be the 10% or the 90%?