Year % 1990 11.6226691092033 1991 14.416005888454 1992 17.2399509131297 1993 20.1211997473033 1994 22.9675129601839 1995 25.5680128621901 1996 28.0227335116449 1997 30.4591084859356 1998 32.7605440961991 1999 34.8444836385831 2000 36.6479746692464 2001 38.2272598049516 2002 39.648798638385 2003 40.9164211951479 2004 42.0369292458932 2005 43.0125585526261 2006 43.8319434628975 2007 44.4836530776533 2008 44.9791826408685 2009 45.2991491455453 2010 45.5182457135411 2011 45.5386003978875 2012 45.4206337984536 2013 45.2344323173037 2014 44.9241440663639 2015 44.5364293566979 2016 44.13261003043 2017 43.6910452830253 2018 43.227523914586 2019 42.7442972581461 2020 42.2464611737437 2021 41.7463061707007 2022 41.2710688330407