Baltic dry index and bonds yield

The Baltic Dry Index has now declined for 17 straight days and hasn't had an up day since early July.
Since its peak in the Spring, the index is now down more than 30%.
Given that the index measures tanker shipping rates, falling prices are considered a sign of global economic weakness.
As you can see the Baltic Dry Index (red line) is highly correlated with Bonds yield.(German 10 yr-black line) and suggests more upside for bonds(at least in the short term).