Year | Value | 2022 | 27.423619516368 | 2021 | 27.623164471439 | 2020 | 27.011186226176 | 2019 | 29.229768139411 | 2018 | 29.163150696076 | 2017 | 28.218849035819 | 2016 | 28.818474690279 | 2015 | 26.095874782034 | 2014 | 25.20469980175 | 2013 | 24.327261991671 | 2012 | 23.332150867318 | 2011 | 22.210776661212 | 2010 | 21.230994884696 | 2009 | 21.040100781235 | 2008 | 20.853529128329 | 2007 | 20.84819828227 | 2006 | 20.690180516019 | 2005 | 20.837795250956 | 2004 | 20.313687777445 | 2003 | 20.286108739247 | 2002 | 20.161921841344 | 2001 | 19.635300568966 | 2000 | 19.512902442325 | 1999 | 19.386111953538 | 1998 | 19.311060827498 | 1997 | 19.4026795717 | 1996 | 19.131038699785 | 1995 | 19.075589980773 | 1994 | 19.111231409498 | 1993 | 19.069392024822 | 1992 | 19.087189060271 | 1991 | 19.124467147948 |
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