Year | Value | 2022 | 1.6922466014689 | 2021 | 2.3117237121295 | 2020 | 1.7742680555761 | 2019 | 1.1363516066917 | 2018 | 1.1405493652354 | 2017 | 1.1499537227939 | 2016 | 0.90447404681918 | 2015 | 0.53827061989964 | 2014 | 0.29374792438245 | 2013 | 0.18592185691693 | 2012 | 0.23552546917312 | 2011 | 0.38521421003851 | 2010 | 0.49688128332595 | 2009 | 0.53942288513487 | 2008 | 0.62650965866051 | 2007 | 0.73144942349835 | 2006 | 0.88577445009264 | 2005 | 1.0753592764444 | 2004 | 1.242331410854 | 2003 | 1.3750266970887 | 2002 | 1.4958326063406 | 2001 | 1.6018374486186 | 2000 | 1.7097758856545 | 1999 | 1.8385525685198 | 1998 | 1.9335403773618 | 1997 | 2.0222881825451 | 1996 | 2.1220706730808 | 1995 | 2.3167306907483 | 1994 | 2.4495704974745 | 1993 | 2.6936717570701 | 1992 | 2.7986801078026 | 1991 | 2.5877359213947 | 1990 | 2.4326971289984 | 1989 | 2.24133395929 | 1988 | 2.1300319059631 | 1987 | 2.1470455198653 | 1986 | 2.2344952431752 | 1985 | 2.3007699495754 | 1984 | 2.3668111333724 | 1983 | 2.3788750016605 | 1982 | 2.335304200868 | 1981 | 2.339969053387 | 1980 | 2.346992709025 | 1979 | 2.3222082589009 | 1978 | 2.2986691062767 | 1977 | 2.2216273425632 | 1976 | 2.1679636973685 | 1975 | 2.1722813816781 | 1974 | 2.1537451229786 | 1973 | 2.1506136756208 | 1972 | 2.1478274330579 | 1971 | 2.1648520888049 | 1970 | 2.1786271301219 | 1969 | 2.1607312903459 | 1968 | 2.1518360265956 | 1967 | 2.1167213955615 | 1966 | 2.0900768095775 | 1965 | 2.0699999809276 | 1964 | 2.020693815317 | 1963 | 1.9857038068622 | 1962 | 1.9638897771539 | 1961 | 1.9208907347449 |
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