Year % 1990 55.79618952134281 1991 56.35776895574427 1992 56.93517096799812 1993 57.48431984568157 1994 57.75219758850998 1995 58.07887221579187 1996 58.32061864594278 1997 58.54526896710145 1998 58.69301959199723 1999 58.80787239385097 2000 58.95339971348511 2001 59.0581999006474 2002 59.14215033520611 2003 59.19712968913908 2004 59.24095571155956 2005 59.317711427621525 2006 59.37795168049904 2007 59.39940160546064 2008 59.47084577642145 2009 59.540636194679934 2010 59.63053039889693 2011 59.78005567816029 2012 60.012375133329186 2013 60.32118509765537 2014 60.69162491371667 2015 61.02106282296054 2016 61.35158019370169 2017 61.69527849640227 2018 62.073766674543194 2019 62.40676121017097 2020 62.7222949294539 2021 63.01697013540149 2022 63.290235245890614