A graph of a model for the sales of services between 2004 and 2008 by Kelly Services, Inc., a leading global provider of staffing services, is shown below. 
Calculate the percentage change in Kelly's sales between 2006 and 2007.
Definitions:
Serotonin
A neurotransmitter in the brain that plays a critical role in regulating mood, anxiety, and happiness.
Addiction
Compulsive drug craving and use, despite the negative consequences of using the drug.
Novelty
The quality of being new, original, or unusual.
Risk Taking
The act of engaging in behaviors that involve potential risks or losses with the expectation of achieving desired outcomes or benefits.
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