Number of people detained at the airport

Currently waiting for a response from Immigration Department, they should respond promptly and normally no later than (details).

Dear Immigration Department,

I am writing to make a data access request about the number of people detained at the airport. May I know, in each of the years between 2018-20:

a) the number of people detained at the airport

b) of those in (a) how many were denied entry and returned for immigration reasons to their home country

c) of those in (a) how many tried to claim protection as Non-Refoulement Claimants

If a CSV or Excel format is possible, I would greatly appreciate it. Otherwise PDF or similar would be fine as well.

Yours faithfully,

Surabhi Chopra