Year annual % 1961 2.220624664159402 1962 -3.607406878430581 1963 6.625054305808618 1964 12.156023952354317 1965 6.3008881042954386 1966 5.048370580816595 1967 2.2121268108918173 1968 -3.3868712163959316 1969 2.571977011339115 1970 -16.018326001475373 1971 2.8744096200628064 1972 1.5436416136095659 1973 19.787585453567402 1974 14.504313995315371 1975 19.178368052353363 1976 18.960258978107063 1977 3.883896695123056 1978 -3.1415790892424837 1979 3.125090557917048 1980 19.263197414290786 1981 10.047858744175258 1982 3.3309582407136133 1983 9.143092799250851 1984 11.526924201274127 1985 9.973758953886275 1986 15.934598432788619 1987 -10.975946658569512 1988 27.42762155944405 1989 7.820709648615875 1990 11.995750083046786 1991 14.610258813735683 1992 20.9081659658449 1993 18.33664244691863 1994 56.70789180493287 1995 15.963377388461964 1996 9.976590041015967 1997 12.726991500805767 1998 14.157417628516683 1999 7.031402536709933 2000 91.3806637936128 2001 13.248329870494914 2002 10.220969864032867 2003 17.98552142174124 2004 19.302924694715358 2005 10.072132103637003 2006 13.51831575322538 2007 4.112256321673087 2008 12.67493917142582 2009 11.601467237965466 2010 7.393823467041386 2011 4.320730613283644 2012 8.20779379091175 2013 8.077148841914834 2014 2.2189860393483087 2015 5.205963298221988 2016 15.703214529551545 2017 13.77987739759341 2018 6.535758875509103 2019 19.80038790062126 2020 18.685186128342693 2021 18.960236405638568 2022 30.20129185644433 2023 31.511963146257585