Looking on the internet deeply has found these results:

since the last week is the most popular phrase on the web.

comparing to the last week 15 results on the web	since the last week 173,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
frame match with some dentists from Culver City. Then absolute rest, right to the last week. Last week we had a down last the to Then absolute rest, right to the last week. Particularly the last week in June.	Since the last week of the campaign. The first electronic identity cards, in other words smart cards with which electronic signatures can be produced, have been on the market since last week. The European Union's growing dependence where energy is concerned is a factor of which account needs to be taken from now on, and that is all the more the case since last week's power failure. Since last week the text of the leaflet is also available on the Internet. A daily bouquet since last week. There's 28 miles on the meter since last week. Not seen her since last week. Also, the Realtor has not had any workers in the loft since last week, but a few do possess keys.

comparing to the last week

15 results on the web

since the last week

173,000,000 results on the web

More popular!

Since the last week of the campaign.
The first electronic identity cards, in other words smart cards with which electronic signatures can be produced, have been on the market since last week.
The European Union's growing dependence where energy is concerned is a factor of which account needs to be taken from now on, and that is all the more the case since last week's power failure.
Since last week the text of the leaflet is also available on the Internet.
A daily bouquet since last week.
There's 28 miles on the meter since last week.
Not seen her since last week.
Also, the Realtor has not had any workers in the loft since last week, but a few do possess keys.