Year | Value | 2024 | 49.335036949273 | 2023 | 49.355481445392 | 2022 | 49.380053201589 | 2021 | 49.429814403091 | 2020 | 49.482125340887 | 2019 | 49.512481024911 | 2018 | 49.540313866864 | 2017 | 49.567272048677 | 2016 | 49.591975154836 | 2015 | 49.610875822966 | 2014 | 49.625103315891 | 2013 | 49.636489738867 | 2012 | 49.645449176891 | 2011 | 49.672589766502 | 2010 | 49.71858591647 | 2009 | 49.764624532525 | 2008 | 49.811180929956 | 2007 | 49.85832273216 | 2006 | 49.906539404445 | 2005 | 49.955249937092 | 2004 | 50.002731619051 | 2003 | 50.047915211041 | 2002 | 50.097119916503 | 2001 | 50.155445036006 | 2000 | 50.219410035494 | 1999 | 50.285371600843 | 1998 | 50.349329429773 | 1997 | 50.40825849655 | 1996 | 50.46283934581 | 1995 | 50.51666937901 | 1994 | 50.571751554425 | 1993 | 50.605989411893 | 1992 | 50.617645308156 | 1991 | 50.628575821862 | 1990 | 50.639839974401 | 1989 | 50.652510342731 | 1988 | 50.667020685669 | 1987 | 50.684781469716 | 1986 | 50.704341666108 | 1985 | 50.724045970023 | 1984 | 50.746403933806 | 1983 | 50.772728369166 | 1982 | 50.803728154243 | 1981 | 50.838352292341 | 1980 | 50.853714855465 | 1979 | 50.846215174372 | 1978 | 50.834510487613 | 1977 | 50.819800921185 | 1976 | 50.805297786849 | 1975 | 50.79270223633 |
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