In article nk.net,
Craig Fink wrote:

FALCON DemoFlight 1* Q1 2006 Falcon 1 Kwajalein
+0
FALCON DemoFlight 2 Q1 2007 Falcon 1 Kwajalein
+0
OSD/NRL Q3 2007 Falcon 1 Kwajalein
-1
ATSB (Malaysia) Q4 2007 Falcon 1 Kwajalein
+1
US Government Q2 2008 Falcon 9 Cape/Kwajalein
-1
MDA Corp (Canada) Q2 2008 Falcon 9 Cape/Kwajalein
+1
NASA ? Demo 1 Q3 2008 Falcon 9 Cape/Kwajalein
-1
SpaceDev Q1 2009 Falcon 1 Vandenberg
+1
NASA ? Demo 2 Q2 2009 Falcon 9 Cape/Kwajalein
-1
MDA Corp (Canada) Q3 2009 Falcon 1 Vandenberg
+1
NASA ? Demo 3 Q3 2009 Falcon 9 Cape/Kwajalein
-1
Swedish Space Corp Q4 2009 Falcon 1 Vandenberg
+1
Bigelow Aerospace Q3 2010 Falcon 9 Cape/Kwajalein
+1 = ????????

Mostly negative, with a plan to end up positive.

OK, I give. I see this is the SpaceX launch manifest, but what do the
numbers represent?