Year | Value | 2022 | 46.701252633059 | 2021 | 45.627300779345 | 2020 | 45.593780894308 | 2019 | 48.68338463186 | 2018 | 49.988975180675 | 2017 | 50.67676025018 | 2016 | 51.366905014371 | 2015 | 55.084436617763 | 2014 | 57.058267753588 | 2013 | 54.770953715259 | 2012 | 53.431355168525 | 2011 | 53.453513639288 | 2010 | 55.095980360927 | 2009 | 54.344673220535 | 2008 | 54.912916857012 | 2007 | 54.379304072849 | 2006 | 53.38199325501 | 2005 | 53.408404889659 | 2004 | 51.284006013147 | 2003 | 55.084249613929 | 2002 | 53.568503727496 | 2001 | 51.823281551228 | 2000 | 52.258204218901 | 1999 | 52.737737553038 | 1998 | 53.068679389387 | 1997 | 54.153079485438 | 1996 | 52.477769541198 | 1995 | 53.355714730952 | 1994 | 53.298615016522 | 1993 | 52.240068933628 | 1992 | 51.691202129997 | 1991 | 54.476767200294 |
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