Year annual % 1961 0.24549930497116487 1962 0.06684988735918293 1963 0.10019111363752414 1964 0.13713610125317288 1965 0.22198388633844707 1966 0.26204595260518554 1967 0.5660323121632455 1968 0.5118092622896412 1969 0.4547694884125594 1970 0.4671636504243716 1971 0.5045419381199858 1972 0.47339064161697586 1973 0.44979192670668805 1974 0.4265005043454202 1975 0.3893672400018076 1976 0.34209770794728894 1977 0.32338598958428344 1978 1.0889779877276784 1979 1.4029633264379198 1980 1.403806129646505 1981 1.414327483219575 1982 1.378192515722968 1983 1.2590270357243487 1984 1.1569018710129144 1985 1.0898074848075574 1986 1.0749232695823108 1987 1.1286168123122877 1988 1.1497391042515412 1989 1.2456950641530022 1990 -0.2576110287991759 1991 -2.227769333036688 1992 -2.784555941356588 1993 -3.0615131768981643 1994 -3.2601225504022544 1995 -1.8593379803394594 1996 -0.38856557354157417 1997 -0.013905304896214374 1998 0.3643749802125791 1999 0.4286066497081239 2000 0.2617892714843472 2001 -0.05505660646283376 2002 -0.13432760729594637 2003 0.10678793277854631 2004 0.37800732296234985 2005 -0.2575772008800697 2006 -0.5620995195377795 2007 -0.2250342828514581 2008 -0.22554182950468493 2009 -0.29222494269188365 2010 -0.3664861608804991 2011 -0.3257274827110359 2012 -0.22125845330406307 2013 -0.17947324156571678 2014 -0.1374619112176871 2015 0.48555740871463904 2016 1.151644206155908 2017 1.2311137094004305 2018 1.1721146831888474 2019 1.1384427434767437 2020 1.1090686694158138 2021 0.577950385977062 2022 0.03950877475420274 2023 -0.02633744871191351