Exact meaning of 'last two days/weeks/years'?

Hello teachers.
Recently I have come across with the phrase 'last 2 years' in an English listening practice.

(fyi: the question in the listening practice asked me to write down the places that an airline passenger visited)

So I was thinking that if the current year was 2014, then the last 2 years would be 2012 and 2013. The I only wrote down the places that the passenger visited in 2012 and 2013.

(Actually the tape script didn't mention 'year 2012, 2013 and 2014', I just write them down here for easy understanding of what I interpreted during the practice.)

However the suggested answer includes the places that the passenger visited in 2014 (the current year).

I'm really confused with the meaning of the word 'last' here.
Sometimes when we say 'last night', we are actually referring to 'yesterday' right?

If that is the case, then why 'last 2 years' means 'the current year and the year before the current year' ? (according to what I found out in the practice)

Thanks in advance!