The life expectancy 
, measured in years, of a child born 
years after 2003 is given by 
.
Identify the slope, and explain in practical terms what it means.
Definitions:
Change Over Time
The concept of transformation or variation in conditions, characteristics, or perceptions across different periods.
Phlegmatic
Describes a personality type characterized by calm, unemotional, and relaxed traits.
Choleric
One of the four temperament types, characterized by a quick, intense, and easily provoked nature.
Melancholic
Describes a type of depression characterized by a profound feeling of sadness or despair that is deeper than typical sadness.
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