Year annual % 1961 -2.864768683274021 1962 13.079318556512181 1963 10.513526648307144 1964 7.446496628554676 1965 6.603001364256481 1966 3.173790632198618 1967 33.49044902009427 1968 -0.6690206281360342 1969 11.842843779232929 1970 6.866845098695216 1971 41.81732801127025 1972 19.541942604856512 1973 21.924195558838466 1974 30.4922377887164 1975 42.32655311493485 1976 34.36901121304791 1977 31.46052072586029 1978 27.913391733896564 1979 34.90724365683762 1980 16.157576162926794 1981 87.09931883482176 1982 27.352350118944667 1983 37.55014257406602 1984 17.74564747632684 1985 14.337083345767063 1986 20.949746186269262 1987 16.27016237794681 1988 39.8274022177887 1989 16.62607426087534 1990 27.402724510350634 1991 33.672927041693654 1992 24.16309428742311 1993 15.131161128513149 1994 21.98246040501879 1995 4.687476048133671 1996 47.586772412202585 1997 -45.47297403110389 1998 20.310594114905093 1999 30.147506112398286 2000 24.036177312223057 2001 154.39078284510416 2002 19.284339840734024 2003 24.6767163542663 2004 22.794206405510216 2005 27.676436049257454 2006 22.75513537065198 2007 20.46143223183793 2008 22.50289525016923 2009 9.241200923840426 2010 0.941285851648117 2011 5.43347065015869 2012 9.932915773890446 2013 9.619170729547497 2014 14.268586488203502 2015 4.028818580957147 2016 3.086079938499657 2017 1.5475478977017847 2018 2.1591607421540906 2019 4.039121341623194 2020 17.77696485308418 2021 8.768853270827652 2022 -2.3551248744056377 2023 5.224306033311212