How to put post tag value in Yoast Seo post title template?

Hello I am using a theme which has multiple tags like this.
https://www.dropbox.com/s/ielq3vpblsmymex/Tags%20In%20my%20site.jpg?dl=0

With Default Yoast Seo Plugin Setup my site shows post title like:

My Post Title – Mysite

How can I setup the Yoast Seo post Title Template to show the title with my post Year tag filed? So If I insert “2015” in Year tags in my post I want to title appear like this:

My Post Title 2015 – Mysite

My current post Title Template is:

%%title%% %%page%% %%sep%% %%sitename%%

What do I have to add in that so that it will automatically add “year” tag filed with every post?

Please I am looking for this solution so badly. If you can help me you will be doing me a big favor. Thanks in advance.

https://wordpress.org/plugins/wordpress-seo/