Year % 1990 44.0660021690854 1991 45.0168764823937 1992 45.8640732122173 1993 46.626302671089 1994 47.332736102598 1995 48.0917431192661 1996 48.7774300325598 1997 49.3991008901546 1998 49.9709284123335 1999 50.4956813258914 2000 50.9758877050811 2001 51.412713507187 2002 51.8058575857123 2003 52.1618953603159 2004 52.4795796513016 2005 52.7711333417263 2006 53.0495428616082 2007 53.3166286570028 2008 53.5761337353983 2009 53.827640201821 2010 54.0671102111657 2011 54.3686818064664 2012 54.7164311037135 2013 55.1127236470393 2014 55.5383780851641 2015 55.9840883977901 2016 56.4467233703466 2017 56.9017175169853 2018 57.3433444416241 2019 57.7365058172802 2020 58.0216364184691 2021 58.2695298932331 2022 58.5172512959672