What is the formula for "Ann Growth" (annual growth)

3 Hwk Q1. 4 Year 5 1997 6 1998 7 1999 8 2000 9 2001 10 2002 11 2003 12 2004 13 2005 14 2006 15 2007 16 2008 17 2009 18 2010 19 2011 20 2012 21 2013 22 Sales Ann Growth $486,854 $486,432 $531,274 $553,421 $556,759 $542,810 $562,781 $564,734 $651,437 $730,116 $762,736 $852,468 $918,163 $979,835 $1,635,036 $1,618,634 $1,761,049 A/Ps $5,821 $9,231 $15,597 $14,718 $10,776 $11,976 $12,059 $16,346 $20,378 $18,194 $21,169 $25,939 $29,777 $39,938 $52,930 $52,753 $54,510