Financial Highlights (Tables)

6 Months Ended

Jun. 30, 2012

Financial Highlights [Abstract]

Purchasing and selling Fund shares

	Three Months Ended						Six Months Ended
	June 30, 2012			June 30, 2011			June 30, 2012			June 30, 2011
Net Asset Value:
Net asset value per share—beginning of period	$	23.55		$	28.02		$	23.21		$	26.74
Net investment income (loss)		(.09	)		(.10	)		(.18	)		(.20	)
Net realized and unrealized gain (loss)		(1.59	)		(1.51	)		(.73	)		(.30	)
Distributions		(.44	)		(.44	)		(.87	)		(.87	)
Net asset value per share—end of period	$	21.43		$	25.97			21.43		$	25.97
Market Value:
Market value per share—beginning of period	$	23.08		$	27.26		$	20.30		$	25.80
Market value per share—end of period	$	20.40		$	26.25		$	20.40		$	26.25
Ratios to Average Net Assets: (a)
Net investment income (loss)		(1.67	)%		(1.48	)%		(1.61	)%		(1.46	)%
Expenses		1.78	%		1.60	%		1.72	%		1.61	%
Total Returns: (b)
Based on Net Asset Value		(7.17	)%		(5.82	)%		(4.10	)%		.25	%
Based on Market Value		(9.74	)%		(2.15	)%		4.55	%		5.03	%

(a) Annualized.

(b) Total Return Based on Net Asset Value is the combination of changes in net asset value per share and the assumed reinvestment of distributions, if any, at net asset value per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the net asset value per share at the end of the period. Total returns are not annualized.

Total Return Based on Market Value is the combination of changes in the market price per share and the assumed reinvestment of distributions, if any, at the ending market price per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the ending market price per share at the end of the period. Total returns are not annualized.