Year | Value | 2022 | 15.486765380441 | 2021 | 18.261964419956 | 2020 | 19.916418887005 | 2019 | 20.535106144474 | 2018 | 22.456693261527 | 2017 | 21.8421159244 | 2016 | 21.858097461494 | 2015 | 23.667057340303 | 2014 | 23.773207863245 | 2013 | 23.760936847016 | 2012 | 23.151030242545 | 2011 | 21.858006038512 | 2010 | 21.265421743587 | 2009 | 18.280563758961 | 2008 | 23.831269389036 | 2007 | 25.104719379466 | 2006 | 23.004987415093 | 2005 | 23.577304354511 | 2004 | 21.182669593254 | 2003 | 20.808497733367 | 2002 | 23.969644813965 | 2001 | 23.957068547226 | 2000 | 24.692244276961 | 1999 | 24.726094340768 | 1998 | 24.819246959517 | 1997 | 25.315723506248 | 1996 | 22.431851755269 | 1995 | 23.847400093275 |
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