These are data on two CPI series for food. The first series is for the period 1997 to 2003 with 1990 = 100, and the second is for the period 2003 to 2007 with 2003 = 100. Combine the two into a single series for the period 1997 to 2007, using 2003 as the base year.

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Series 1 Series 2 (1990 = 100) (2003 = 100) Year 1997 122.8 1998 128.8 1999 134.9 2000 141.4 2001 149.3 2002 153.5 2003 160.6 100.0 2004 104.9 106.3 2005 2006 108.8 2007 110.2