Your statement is sent on the anniversary of your account opening but your interest is paid on the anniversary of your deposit. This means that unless you made your first deposit on the day you opened your account, your annual statement will not display interest earned over the last 12 months.
For example, if you opened your account on 1st March 2017 but the account wasn't funded until the 5th, then your annual statement will be issued on 1st March 2018 but your interest won't be paid until the 5th March 2018. The first annual statement won't show any interest, but this will appear on your next statement.