stress in –teens

Hi,
I wonder if you could explain how you stress –teen numerals in these collocations
1. he is in room nineteen
2. nineteen per cent of the population
3. was born in nineteen seventy-seven
4. lucky numbers are nineteen, thirteen and seventeen.
5. nineteenth nervous breakdown

Would it grate on your ears if I only stress the last syllable everywhere?

Thanks.

I think it generally has the same stress as the first syllable in US English -- they kind of get equal footing.

Yeah, I keep saying the -teens to myself and I'm saying them with equal stress...

Uriel and Skippy, thank you.

I say them all with equal stress EXCEPT number 1., where I say:

He is in room NineTEEN

with greater stress on the -teen than on the nine-.
Not because it comes at the end of the sentence though, because "nineteen" specifies the room and therefore takes greater stress for me