$BLV(BLV)$ Vanguard Long-Term Bond ETF Expense ratio 0.10% (as of 04/29/2014) Fund total net assets $6.8 billion (as of 07/31/2014) Inception 04/03/2007 Asset class Long-Term Bond Number of bonds 1752 Average effective maturity 24.1 years Average duration 14.4 years 网页链接