Year annual % 1961 2.7821588820763594 1962 3.9259670791178323 1963 3.2775844406985897 1964 4.196219609856556 1965 3.8531480713102297 1966 4.031548325483932 1967 3.592211171803818 1968 4.130898186399591 1969 4.512154933952225 1970 5.534817510625288 1971 6.59778759528492 1972 6.881816165883414 1973 8.834546319364804 1974 13.081048206655211 1975 11.943728669940512 1976 9.186661851035801 1977 7.823897122634172 1978 7.454189313106369 1979 8.29672198172402 1980 11.127109004531448 1981 9.493623775246874 1982 8.455841886455126 1983 5.612850366099593 1984 5.183243101340437 1985 4.290953963739412 1986 3.7422613886625413 1987 4.75468874973275 1988 4.704229380810304 1989 5.366039541950691 1990 4.65052231416761 1991 4.952193837899777 1992 3.641744997692065 1993 3.9395918904271454 1994 3.542425451797122 1995 3.975491108296467 1996 2.4647009652858713 1997 2.218203687689069 1998 1.2856950678396188 1999 1.4756132820918353 2000 1.928375557471817 2001 2.5009685959897183 2002 2.0950819718660085 2003 2.021365972919156 2004 2.675990445579025 2005 2.582412552030867 2006 2.6400035085270517 2007 3.218998123085406 2008 3.1336626136193786 2009 1.394832016104644 2010 1.176953673622016 2011 1.8203548560719156 2012 1.47370495417821 2013 1.4825303364234443 2014 1.3292807767720376 2015 1.4048846047571502 2016 1.0423362497925055 2017 1.843406921345732 2018 2.004664358906588 2019 2.018703834706777 2020 1.7541564887279364 2021 2.9720759751698296 2022 5.9539688866333975 2023 5.472333303987085