Year

Hi everybody,
I am making a catalogue for my company and I wish to express that the upcoming year will be the 10th year of my company. How should it be written in a logo?

10. years
10. year
10th year
10th years

PS: I do not wish to use ( th ) because the catalogue it self will be in english but we live in Turkey so when I will use it on my cars nobody will understand the (th) addition... But I will if I really have to...

Thank you