Commercial traffic between Canada and Alaska can be of great interest to businesses that ship to and from Alaska and to economists and investors concerned with those businesses. Here are the border crossings by trucks between Canada and Alaska, recorded each month from 1999 through 2009:

QUESTION: Describe the components of this time series.

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Trucks 1600 1200 800 400 1999 2000 2001 2002 2003 2004 2005 Year 2006 2007 2008 2009