"The Vanguard Group of Investment Companies" "Vanguard Bond Index Fund -- Intermediate Term" USD 199404 -0.92 199405 -0.09 199406 -0.29 199407 1.83 199408 0.26 199409 -1.63 199410 -0.26 199411 -0.49 199412 0.85 199501 2.04 199502 2.60 199503 0.72 199504 1.54 199505 4.86 199506 0.84 199507 -0.54 199508 1.26 199509 1.13 199510 1.64 199511 1.80 199512 1.47 199601 0.71 199602 -2.21 199603 -1.01 199604 -0.99 199605 -0.369 199606 1.467 199607 0.149 199608 -0.249 199609 1.905 199610 2.620 199611 2.046 199612 -1.413