2
4
6
8
10
12
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
month
log(sales)
year: 2000
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
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