From the figure below, please provide an explanation for the large decline in the growth rate of international reserves held by developing countries in the 2008-2009 period. 
Definitions:
Mental Disease
A broad category of conditions affecting an individual's thinking, perception, behavior, or mood, significantly impacting day-to-day life.
Voluntary Use
The choice or decision to use or engage in a particular behavior or substance without coercion.
Irresistible Impulse Rule
A legal defense theory that argues a defendant was compelled by an uncontrollable impulse to perform an illegal act, as a result of mental illness, and therefore should not be held accountable.
M'Naghten Rule
A legal standard used to determine criminal liability, which states that a defendant cannot be found guilty if, at the time of the crime, they were so afflicted by a mental disease that they did not know the nature of the act or could not distinguish right from wrong.
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