Looking on the internet deeply has found these results:

PER YEAR is the most popular phrase on the web.

PER/YEAR 1130,000,000 results on the web	PER YEAR 1189,000,000 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.	HIV alone attracts many billions per year. This amounts to two additional months of unpaid work per year. Emissions in atmospheric air made 1.2 tons per year. 3 ACRES WITH OLIVE TREES producing about 250 Kg OIL PER YEAR HIGH NUMBER OF ELECTRICAL CYCLES (MORE THAN 150000 PER YEAR) INFORMATION ON EXPOSURE FOR SUBSTANCES REGISTERED IN QUANTITIES BETWEEN 1 AND 10 TONNES PER YEAR PER MANUFATCURER OR IMPORTER About 200,000 maternal deaths per year result from the lack or failure of contraceptive services. The system would have to handle an estimated 16 million transactions per year for alcohol and tobacco alone.

PER/YEAR

1130,000,000 results on the web

PER YEAR

1189,000,000 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.

HIV alone attracts many billions per year.
This amounts to two additional months of unpaid work per year.
Emissions in atmospheric air made 1.2 tons per year.
3 ACRES WITH OLIVE TREES producing about 250 Kg OIL PER YEAR
HIGH NUMBER OF ELECTRICAL CYCLES (MORE THAN 150000 PER YEAR)
INFORMATION ON EXPOSURE FOR SUBSTANCES REGISTERED IN QUANTITIES BETWEEN 1 AND 10 TONNES PER YEAR PER MANUFATCURER OR IMPORTER
About 200,000 maternal deaths per year result from the lack or failure of contraceptive services.
The system would have to handle an estimated 16 million transactions per year for alcohol and tobacco alone.