A consumer expenditure survey reports the following information on entertainment spending: 
Using 2008 as the base year, by how much does a "cost of entertainment" index increase between 2008 and 2009?
Definitions:
Identical Twin
A twin developed from a single fertilized ovum, sharing the same genetic material and often exhibiting very similar physical characteristics.
Fraternal Twin
Siblings born at the same time who are the result of the fertilization of two different eggs by two different sperm, making them genetically as similar as non-twin siblings.
Anorexia Nervosa
An eating disorder marked by an intense fear of gaining weight and a distorted body image, leading to restricted food intake.
Hypothalamus
A small region of the brain located below the thalamus, responsible for hormone production and regulation of key bodily functions such as temperature and hunger.
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