The index variable (YEAR in your example) is incremented by 1 at the end of each iteration. The looping will not stop until the index variable is outside of the range (1990 through 2004 in your example).
So, in the last iteration YEAR=2004, a valid value. At the end of that iteration, it is incremented to 2005, at which point the index variable first becomes outside of range., and no more loops are executed.
The index variable (YEAR in your example) is incremented by 1 at the end of each iteration. The looping will not stop until the index variable is outside of the range (1990 through 2004 in your example).
So, in the last iteration YEAR=2004, a valid value. At the end of that iteration, it is incremented to 2005, at which point the index variable first becomes outside of range., and no more loops are executed.
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