The following table presents per unit performance data and other supplemental financial data for the years ended December 31, 2012, 2011 and 2010. This information has been derived from information presented in the financial statements.


	Year ended December 31, 2012			Year ended December 31, 2011			Year ended December 31, 2010
Per Unit Operating Performance:

Net asset value, beginning of year	$	43.46		$	42.91		$	40.37
Total income (loss)		(3.32	)		0.88			2.87
Net expenses		(0.33	)		(0.33	)		(0.33	)

Net increase (decrease) in net asset value		(3.65	)		0.55			2.54

Net asset value, end of year	$	39.81		$	43.46		$	42.91


Total Return		(8.40	)%		1.28	%		6.29	%


Ratios to Average Net Assets
Total income (loss)		(6.94	)%		2.08	%		7.93	%

Management fees		0.60	%		0.60	%		0.60	%

Expenses excluding management fees		0.18	%		0.17	%		0.24	%

Net income (loss)		(7.72	)%		1.31	%		7.09	%