Year annual % 1961 2.6879999900078673 1962 2.010371570425008 1963 3.174916400735455 1964 2.9061779508730012 1965 2.7532248929641696 1966 3.59364081326936 1967 2.2449637535619758 1968 2.415383585082381 1969 3.5639042250928696 1970 3.960561146989278 1971 4.801224156132982 1972 6.350062031426518 1973 12.561803068423927 1974 18.887844032300137 1975 10.191238508587723 1976 9.172109716602165 1977 10.645054819018142 1978 8.489682226806103 1979 12.471419721199986 1980 13.912665228118357 1981 9.577975179868133 1982 8.11308950866379 1983 8.52030774030598 1984 9.687012653047887 1985 7.850844924908259 1986 6.569952894922309 1987 9.259258910014651 1988 9.060963477006354 1989 8.510928443143143 1990 11.858705769931419 1991 14.610258813735683 1992 12.900034483506765 1993 11.297973858390549 1994 16.95231602776029 1995 11.076427188031019 1996 8.942193918969757 1997 6.9968221858600685 1998 6.9403213402784445 1999 6.571912343553905 2000 6.830114668211266 2001 5.381665409999066 2002 4.222739023660665 2003 5.618312718950072 2004 7.048760405384712 2005 6.961863679354259 2006 7.5567994224615305 2007 7.107540768393271 2008 9.228983155695374 2009 3.1394132185125443 2010 6.105161914413294 2011 7.83332804468386 2012 4.85536378121445 2013 3.5766963467300528 2014 2.8603116065973495 2015 2.8735872490253627 2016 2.8424752175098575 2017 4.055265402608811 2018 3.5486607641573187 2019 2.9086112914750615 2020 2.7534131423986423 2021 5.576508274682631 2022 8.262272814757438 2023 5.357882540293822