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 2004 and 2007.
Definitions:
Enriched Environments
Enriched Environments are settings or conditions that provide enhanced stimuli and opportunities for physical and cognitive activities, promoting better development and health.
Motor Development
The progression of muscular coordination, strength, and movement patterns in children and adolescents.
Maturation
The process of development in which an individual matures or reaches full functionality.
Imprinting
The process by which certain animals form strong attachments during early life.
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