Looking on the internet deeply has found these results:

In the beginning of 2015 is the most popular phrase on the web.

At the beginning of 2015 14,150,000 results on the web	In the beginning of 2015 16,870,000 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.	In the beginning of this year, I was just another football player. Those concerns were reflected in the presidency declaration at the beginning of May. Since the beginning of time, men have believed in the possibility of projecting evil thoughts. The beginning of this Article confirms that Directive 95/46/EC is fully applicable to personal data included in the registers. This conference is going to rank as the most important in the beginning of the 21st century. That was in the beginning of the last century. In the beginning of a relationship everyone sculpts the truth a bit. In the beginning of the Internet age I think we were somewhat perplexed.

At the beginning of 2015

14,150,000 results on the web

In the beginning of 2015

16,870,000 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.

In the beginning of this year, I was just another football player.
Those concerns were reflected in the presidency declaration at the beginning of May.
Since the beginning of time, men have believed in the possibility of projecting evil thoughts.
The beginning of this Article confirms that Directive 95/46/EC is fully applicable to personal data included in the registers.
This conference is going to rank as the most important in the beginning of the 21st century.
That was in the beginning of the last century.
In the beginning of a relationship everyone sculpts the truth a bit.
In the beginning of the Internet age I think we were somewhat perplexed.