Northern Ireland split over Irish unity

From the Belfast Telegraph a new poll on identity gives the following response:
42% said they considered themselves Irish
39% British
18% Northern Irish

And on unification:
36% in favour of United Ireland
55% to remain in UK
(Can’t quite find out the missing 9%)

Interestingly on expectations:
Will NI still be part of the UK by 2021?
Yes: 42%
No: 42%

Here’s the BBC report – Irish identity tops new Northern Ireland Poll.