with data as (
    select model from T where "year" = 2010
    except
    select model from T where "year" = 2009
)
select model, 2010 from data;

or

select model, 2010
from T
where "year" in (2009, 2010)
group by model
having min("year") = 2010;

or

select * from T
where "year" = 2010
and model not in (
    select model from T
    where "year" = 2009
        and model is not null
);

or

select * from T t1
where "year" = 2010
    and not exists (
        select 1 from T t2
        where t2.model = t1.model
            and t2."year" = 2009
    );

or

select t1.*
from T t1 left outer join T t2
    on t2.model = t1.model and t2."year" = 2009
where t1."year" = 2010 and t2.model is null;

You can do something like this:

SELECT Model, year
FROM test 
where Model not in (select Model from test where year != 2010)
      and Model in (select Model from test where year = 2010)

This will return rows with Model that exist only once