The following table shows the price of a specific stereo receiver for a five-year period.Using year 3 as the base year, calculate the price index for each year. 
Definitions:
Group Therapy
A form of psychotherapy involving one or more therapists working with several individuals simultaneously, beneficial for learning from others' experiences and receiving support.
Albert Ellis
An American psychologist who developed Rational Emotive Behavior Therapy (REBT), a form of cognitive-behavioral therapy emphasizing the role of beliefs and attitudes in emotional distress.
Term Paper
A research paper written by students over an academic term, representing a large portion of a grade.
Cybertherapist
A professional who provides psychological support and counseling through digital platforms, including video calls, messaging, or online programs.
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