iShares Barclays 20+ Yr Treas.Bond (ETF) - 2017  (Inactive Symbol)

The following graph plots the year-to-date performance of the stock for 2017 compared to the probability calculated by a random walk model.

Initial Value*: $118.4 Hist. Volatility: 0.55% Annual Drift: 7% Final Value*: $121.4 Percentile: 36%
Click on the image for the high resolution version.

The high to date and low to date prices of the stock plotted against a random walk model for 2017 (what's this?).