Based on the diagram, we can comment from 1 to 2 with a reduction (from $ 27.22 reduced to $ 23.87) and 2 to 4 has increased (from $ 23.87 to $ 28.64). From 4 to 6 decreased (from $ 28.64 con25.53 $) and from 6 to 7 with mildly. ($ 25.53 to 26.03). But from 7 to 10 have significantly reduced (from $ 26.03 was $ 18.88). And from 10 to 12 have increased again ($ 18.88 to $ 24.52). From 12 to 13, a slight decrease ($ 24.52 REMAINING $ 23.62). From 13 to 16 has the ebb and not widespread speculation. On average in 2008 and first half of 2009 with the largest increase fell despite rising instability. Second half 2009 to first half 2010 have plummeted. Half a year later in 2010 and 2011 despite increasing instability reduction but became stronger than the decline.
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