Year % 1961 5.200152170147846 1962 6.0132742755411375 1963 2.4232729826850763 1964 3.6678786204660256 1965 3.8000711153698226 1966 3.2462081771334157 1967 4.231876634729014 1968 4.2449073811975815 1969 0.5711172505716957 1970 3.320387344161037 1971 2.7268323943752044 1972 -1.7429602295817845 1973 -7.792578939247459 1974 -4.0507198239364595 1975 0.7633177807941668 1976 1.7753013052386692 1977 2.0348155177754985 1978 1.4516558202552272 1979 -3.476381372583921 1980 -11.009010693909975 1981 2.3280285298695538 1982 4.1724335866738995 1983 -0.34377461518215724 1984 10.060939263363244 1985 4.611218370553059 1986 -1.9917665571008474 1987 -2.0444670741039355 1988 -0.07580874408808891 1989 2.350216100858939 1990 4.811415257074417 1991 4.027493262138757 1992 3.654137357588827 1993 2.4646878258743423 1994 5.255469726672358 1995 6.367395240389547 1996 10.644809366874814 1997 10.969898915902133 1998 12.691033621385127 1999 10.395066979821218 2000 4.870582386536573 2001 5.538341433393613 2002 2.8541855157597866 2003 8.04784838936569 2004 4.950384358862208 2005 4.761489202965447 2006 4.810302279605195 2007 4.5460456685602475 2008 6.745151502916917 2009 2.8025089767470512 2010 3.490959789796722 2011 3.2793012231763545 2012 3.8828729981093715 2013 2.5092454971563325 2014 3.5670276301250867 2015 3.667742832971566 2016 3.278251678451929 2017 4.6473154854795204 2018 5.856183558041493 2019 5.268415652545532 2020 2.326406505387741 2021 0.508486044889905 2022 3.848990416221104 2023 6.673286028438076