Looking on the internet deeply has found these results:

at the end of the year is the most popular phrase on the web.

as of the end of the year 1130,000,000 results on the web	at the end of the year 1439,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	I still intend to step down at the end of the year. This would help to avoid cancellation of appropriations at the end of the year. GoDaddy CEO Blake Irving is stepping down at the end of the year. The Executive Committee would examine this question again at the end of the year. Keeping better track of your expenses will yield more deductions at the end of the year. From 2006, this distribution will occur at the end of the year only. The amendment aims at ensuring the availability of the financial means at the end of the year. Sales would rapidly increase at the end of the year.

as of the end of the year

1130,000,000 results on the web

at the end of the year

1439,000,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

I still intend to step down at the end of the year.
This would help to avoid cancellation of appropriations at the end of the year.
GoDaddy CEO Blake Irving is stepping down at the end of the year.
The Executive Committee would examine this question again at the end of the year.
Keeping better track of your expenses will yield more deductions at the end of the year.
From 2006, this distribution will occur at the end of the year only.
The amendment aims at ensuring the availability of the financial means at the end of the year.
Sales would rapidly increase at the end of the year.