"The Vanguard Group of Investment Companies" "Vanguard Bond Index Fund -- Short-Term" USD 199404 -0.59 199405 0.04 199406 0.26 199407 1.10 199408 0.28 199409 -0.55 199410 0.09 199411 -0.54 199412 0.23 199501 1.60 199502 1.65 199503 0.66 199504 0.95 199505 2.40 199506 0.52 199507 0.33 199508 0.63 199509 0.61 199510 0.93 199511 1.00 199512 0.91 199601 0.90 199602 -0.63 199603 -0.37 199604 -0.12 199605 0.096 199606 0.897 199607 0.299 199608 0.302 199609 1.002 199610 1.421 199611 0.991 199612 -0.297