| Year | Value | | 2023 | -89.626081306096 | | 2022 | -89.48809483335 | | 2021 | -87.582136287615 | | 2020 | -79.703982171926 | | 2019 | -75.769176162835 | | 2018 | -75.00340020361 | | 2017 | -71.731472577242 | | 2016 | -69.117304608807 | | 2015 | -68.422155970413 | | 2014 | -66.696675219292 | | 2013 | -65.704813061921 | | 2012 | -59.752254989299 | | 2011 | -56.29299600983 | | 2010 | -55.142238487719 | | 2009 | -52.911170373126 | | 2008 | -52.79255807517 | | 2007 | -54.590048846893 | | 2006 | -50.428760720976 | | 2005 | -47.977100844575 | | 2004 | -50.389794465674 | | 2003 | -49.269133846543 | | 2002 | -54.762451982741 | | 2001 | -51.790604506391 | | 2000 | -50.589519233263 | | 1999 | -49.873936009955 | | 1998 | -52.138068213127 | | 1997 | -50.463863335893 | | 1996 | -50.42806480448 | | 1995 | -51.081815392113 | | 1994 | -46.185202868598 | | 1993 | -42.052582551602 | | 1992 | -38.804629674351 | | 1991 | -36.179582524522 | | 1990 | -28.035108915929 |
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