[tlhIngan Hol] numbers and {-vam}

If we want to say "during these two years you have irritated us", then which of the following would be correct ? qaStaHvIS cha'vam DIS nuberghmoH or qaStaHvIS cha' DISvam nuberghmoH And because someone, will probably say: don't use "these two years", use "the previous two years", here is another example: "as soon as we saw these two ships we became ready to fight" cha'vam Duj DIleghDI' maSuvrupchoH or cha' Dujvam DIleghDI' maSuvrupchoH So, the question is, whether we can place the {-vam} on a number. ~ nI'ghma