Quarterly enrollments in business statistics class for three years are shown in the table below.Compute the four-quarter centered moving averages. 
Definitions:
Sexual Behaviors
Actions that are related to physical intimacy or the expression of sexual preferences and desires.
Genital-Pelvic Pain/Penetration Disorder
A sexual dysfunction characterized by significant pain during intercourse and difficulty with penetration, affecting an individual's sexual health.
Pubococcygeus Muscle
A muscle of the pelvic floor that supports the pelvic organs and is involved in urinary control as well as sexual function.
Spasms
Sudden, involuntary muscle contractions that can be painful or uncomfortable.
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