since the last week vs comparing to the last week

Some examples from the web:

• Since the last week of the campaign.
• There's 28 miles on the meter since last week.
• Also, the Realtor has not had any workers in the loft since last week, but a few do possess keys.
• Since last week the text of the leaflet is also available on the Internet.
• 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.
• A daily bouquet since last week.
• Not seen her since last week.
• Okay, so four guys have called in sick since last week.
• Their families say they've been on a fishing trip since last week.
• Fortunately, since last week there appears to be some movement in the negotiations following the latest American proposals.
• Lilah hasn't been here since last week.
• Patrick, it's only since last week.
• Since last week, it seems like everyone has decided to hate me except for you.
• And lastly, the school's orangutan mascot's been missing since last week.
• What's changed since last week?
• Since last week, we have been mating like hamsters!
• River's dropped a foot since last week, so this wasn't unexpected.
• Since last week There is unmistakeable evidence has established the fact that a series of offensive missiles sights is now in preparation on that imprisoned island.
• The above-mentioned change in the current account position since last week includes the effect of a correction amounting to EUR 0.3 billion.

Some examples from the web:

• Then absolute rest, right to the last week.
• Then absolute rest, right to the last week.
• Last week we had a down-to-the-last-frame match with some dentists from Culver City.
• Particularly the last week in June.
• I've left you ten voicemails in the last week.
• He's left four signals for him in the last week.
• In the last week alone, 11 previously uninhabitable zones have been reopened.
• Only one utility yard reports vehicle thefts in the last week.
• The company has had three DUls in the last week.
• That's a lot of calls in the last week.
• I just spent the last week tied up in Bodaway's basement.
• I found no reports for a stolen red Sedona in the last week.
• She spent the last week under psychiatric supervision.
• You've been talking to him every day for the last week.
• By the way, interesting program the last week.
• This whole place has felt funny for the last week.
• This whole place has felt funny for the last week.
• She spent the last week with the A.U.S.A.
• I pulled all her calls in the last week.
• Maybe he just takes at night during the last week.