India, Emily and Morgan from Stourport, England sent in good solution.

We found out that if you can work out the first year you can work out all the other years too!
For example in $2010$ it will be the $4$.$6$.$10$ and $4 + 6 = 10$ so that means if you can work out that you can work out all the other years too.
Also you will be able to work more quickly if you understood the problem.
Thank you for reading it
It was a great pleasure working with you!

Well that's a pleasant way to end an email! Thank you.