Question from the English : Email reading test

Email :

From: Li Wei <[email protected]>
To: Jean Dupont <[email protected]>
Cc: IT Team <[email protected]>
Subject: Quarterly Performance Report

Hi Jean,

I hope you're doing well. I've completed the performance report for the last quarter, and there are several key metrics that we should discuss:

1. Our website traffic increased by 25% compared to the previous quarter, reaching a total of 500,000 unique visitors.
2. The average session duration decreased by 10%, now averaging 4 minutes per session.
3. The bounce rate improved by 5%, currently standing at 40%.
4. We saw a 15% increase in user registrations, totaling 8,000 new users.
5. Revenue from our premium services grew by 20%, amounting to $120,000 this quarter.

These numbers indicate positive trends in user engagement and revenue growth, but the drop in session duration is something we might need to address. 

Let's schedule a meeting to go over these details and plan our strategy for the next quarter.

Best,
Li

Which number indicates an improvement in user engagement?