market share of world manufacturing output of russia and USA are given in the table. let "t" be number of years since 2000
year Russia USA
2004 22.8 11.1
2005 22.5 11.9
2006 21.7 12.8
2007 21.4 13.9
2008 20.8 15
2009 20.6 17.2
2010 20 18.9
1. find a quad. model function for USA
2. estimate in what year the market share of world manufacturing output of Russia is equal to USA
