Answer
The magnetic field strength is decreasing.
Work Step by Step
If the magnetic field directed into the page is decreasing, there is less magnetic flux going through the loop. By Lenz's law, a current is induced around the loop which opposes the change in flux. Then, the current must produce a magnetic flux directed into the page. By the right hand rule, this current flows clockwise around the loop.
Since the current flows clockwise around the loop, we can conclude that the magnetic field strength is decreasing.
