Year annual % 1961 2.802811260841054 1962 3.0301826326870582 1963 3.4563610463355445 1964 4.1846288222329875 1965 2.3623121214866316 1966 3.59364081326936 1967 3.1462220056261927 1968 3.022718324108382 1969 3.334312403135833 1970 4.272866907501246 1971 5.224137384234773 1972 6.8343527266781265 1973 15.752314743952596 1974 24.48233740257637 1975 16.229944283652173 1976 9.963858031396086 1977 14.25011961625897 1978 9.021906752928992 1979 15.368706979464932 1980 19.046388911301506 1981 11.568852534747393 1982 7.512025238453603 1983 7.496956847108407 1984 15.737532092894213 1985 10.420210832766202 1986 9.38727107753951 1987 10.14438326894971 1988 12.72883171456536 1989 12.129493238722503 1990 25.008687485377806 1991 21.390982300084445 1992 11.30074367281236 1993 10.43557217032128 1994 12.573370441994285 1995 11.076427188031019 1996 6.581718610619774 1997 4.915154726667652 1998 5.37109035742958 1999 3.882996065208303 2000 5.606065140857353 2001 4.27714698160932 2002 3.4760208551481924 2003 5.331077197509515 2004 7.024761706878223 2005 6.667724557185025 2006 6.7742741191329685 2007 6.625507168286006 2008 8.778552723675602 2009 3.6001752730532814 2010 5.443413315424863 2011 5.8440989281363045 2012 4.542214937769046 2013 2.92309825170382 2014 2.4324410850177856 2015 2.7732812185904834 2016 2.67571827706805 2017 3.643521386905043 2018 2.4679567190971667 2019 3.0115339588279753 2020 1.6530534807468698 2021 4.807757546267176 2022 7.25403854960863 2023 4.697411400987569