Year annual % 1966 3.932998240142439 1967 3.9366597755996082 1968 4.399274072039788 1969 4.4333987047007355 1970 5.4247392538376005 1971 6.9613743335271465 1972 6.91008466334474 1973 10.274553703448042 1974 15.757296221994501 1975 13.120019411895981 1976 9.343511011234561 1977 8.788178026466149 1978 7.24405998436319 1979 10.404987799504838 1980 11.758155747305423 1981 10.693957607658604 1982 8.827078400984504 1983 5.900721036604928 1984 5.310980172043379 1985 4.867042728053789 1986 4.150668939876169 1987 4.841889695507959 1988 4.29757874863882 1989 5.43581244333582 1990 5.769869904630838 1991 3.9248311735183634 1992 3.7117126970505723 1993 3.5179441523697648 1994 3.0349791294123705 1995 3.2760579002834547 1996 2.8115314352770824 1997 2.3168775480781676 1998 2.0807336761724997 1999 2.3019920192075602 2000 3.01797428833477 2001 2.483522966054764 2002 2.7257425856219726 2003 2.4518279154123235 2004 3.0424239980269476 2005 2.935328139921296 2006 3.0838367335286563 2007 3.358471201773277 2008 3.9453274576743667 2009 1.3287534124704337 2010 1.4303557455005063 2011 1.8334102445566316 2012 1.9116421347553967 2013 1.3068161918534216 2014 1.3277854278746304 2015 1.3237145324991175 2016 0.9242492028647362 2017 1.986797417373026 2018 2.013401108900048 2019 1.7840504205757597 2020 1.317150028055174 2021 3.078774163956325 2022 5.6835466331717726 2023 5.27321445450562