Year annual % 1961 3.167230638499632 1962 0.15994817787643 1963 3.5699250638710396 1964 1.5987104542863904 1965 7.931704956588575 1966 6.296188834066399 1967 7.939641765796864 1968 2.415383585082381 1969 3.3433643381499962 1970 3.708353022223207 1971 4.458444375608977 1972 6.774575140906961 1973 13.017697034709315 1974 20.82566953298233 1975 5.35029466941981 1976 5.981859341075449 1977 0.010759404529721905 1978 8.982345695884234 1979 12.564505989954938 1980 11.508320807462042 1981 9.894690311899538 1982 9.34740967360203 1983 8.487755878370834 1984 9.653554452375317 1985 6.508614700434308 1986 6.789400453561754 1987 9.327893305982442 1988 9.617560649784096 1989 8.436808869097973 1990 6.532735292255111 1991 12.5446382094389 1992 9.40370611580596 1993 9.861782854754097 1994 9.770584820075044 1995 8.284382710938829 1996 8.11263265655306 1997 7.279092977635202 1998 7.5260368956337516 1999 4.162701158847625 2000 4.472433718719529 2001 5.675061486962321 2002 3.9281182344124375 2003 3.7460521606674604 2004 6.4883781060477475 2005 6.299296405246444 2006 7.279895285974661 2007 8.967306766142158 2008 8.527467860157358 2009 6.902360058281758 2010 8.835346941637276 2011 10.893680012252034 2012 8.049480577096162 2013 6.568763617515813 2014 4.925992557070025 2015 3.8626264146197826 2016 3.694689455634233 2017 4.243954260817738 2018 3.8630134523435444 2019 3.7643325816970616 2020 4.3279606523907574 2021 7.195366129823164 2022 7.494352518218328 2023 5.416145184861335