What is normal capacity versus number of cycles?

I own a MacBook Core 2 Duo 15" 3.33 GHz bought in November 2006.
I use it many hours a day on battery. Only when the low battery message appears do I connect it to power. It stays connected to power all night long (7 hours). The battery charges always to full capacity (99-100%) without problem.
But I am surprised by the way the maximum capacity is falling. For the first 6 months, the current capacity decreased slowly to 84-85% of the maximum.
I always apply all the updates including the battery update 1.2.
These last weeks, battery capacity as fallen to 50-55% but once it was again in the 80. From time to time I do a calibration of the battery.
Now, since a few days, in has dropped as low as 48% of the maximum. Number of cycles is reported as 360 for a total of 10 months.
I have made a new calibration leaving the computer alone for 5 hours after going to sleep after the low battery message, charging completely, leaving the computer connected for two hours,.. Capacity went from 46 to 50%.
In view of the high humber of cycles, is this a normal behaviour?

I calibrated my battery two times more (!); after the first operation capacity went to 54% and I used the computer normally; when power was nearly exhausted it suddenly jumped to 84%: a few minutes later the computer went to sleep.
After the second calibration, capacity was first given as 52% and completely charged (100%) . I didn't use the MacBook Pro for more than a few minutes and then I shut it down and left there not connected to AC for a few hours. Using it now, capacity is back at 84%.
I am working for more than an hour now on battery and everything seems to stay OK.
If this value for the capacity is maintained I will certainly not need to call Applecare as indeed the battery is within spec.
Thanks for the feedback.

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