Units Outstanding (Tables)

12 Months Ended

Dec. 31, 2011

Units Outstanding [Abstract]

Changes in Units Oustanding

Changes in units outstanding for the years ended December 31, 2011 and 2010 were as follows:

	2011			2010
Outstanding as of January 1,		278,115,232			274,745,592
Options exercised		86,543			486,017
Units issued		-			3,249,861
Units retired		(354,187	)		(365,410	)
Units forfeited		-			(828	)
Outstanding as of December 31,		277,847,588			278,115,232