WordsnCollision - 3:36 pm on Dec 13, 2011 (gmt 0)

Panda 1.0 crushed my metrics by around 60% but the July 23rd update (Panda 2.3) brought things back to normal plus 20%. Been cruising since then (knock on wood).

Here are the official updates according to Wikipedia:

Panda Update (Minor) – 13 October,2011 (2 Weeks Gap)
Panda Update 2.5 – 28 September, 2011 (7 Weeks Gap)
Panda Update 2.4- 12 August, 2011 (3 Weeks Gap)
Panda Update 2.3- 23 July, 2011 (5 Weeks Gap)
Panda Update 2.2- 16 June, 2011 (5 Weeks Gap)
Panda Update 2.1- 10 May, 2011 (4 Weeks Gap)
Panda Update 2.0- 11 April, 2011 (7 Weeks Gap)
Panda Update 1.0- 24 February, 2011 (THE FIRST PANDA UPDATE)