Year annual % 1960 3.27424913835588 1961 6.69845053635209 1962 1.40750670241315 1963 1.76250275391075 1964 2.01342281879186 1965 2.63157894736852 1966 1.90239867659225 1967 3.02353896103856 1968 5.92869805002995 1969 6.30345853477095 1970 14.7280041962567 1971 5.33617929585868 1972 5.42770299630751 1973 17.6825919824838 1974 27.1581894550216 1975 17.3761467885801 1976 9.79365327534651 1977 11.1910016370359 1978 34.8998015240508 1979 29.0792596109786 1980 27.3081589882307 1981 12.7397181145091 1982 6.54540796720066 1983 11.5821110844253 1984 27.8147693237453 1985 25.6731012391772 1986 15.1053754209796 1987 6.65244804962684 1988 8.26676574400908 1989 14.3295390328572 1990 21.9601751165083 1991 51.0710977304313 1992 77.2965929559651 1993 22.0699494185292 1994 35.0633942484772 1995 19.9087488364168 1996 26.4066566074043 1997 9.65755261268595 1998 8.63189613012144 1999 5.95423949113006 2000 8.17108356120225 2001 6.8019093078759 2002 7.07635009310985 2003 10.0869565217391 2004 13.5545023696682 2005 15.0528658875905 2006 8.56106408706157 2007 9.24482067275562 2008 22.0228384991843 2009 9.59224598930482 2010 12.6105519975603 2011 7.555856465809 2012 6.87397708674309 2013 9.34150076569673 2014 8.27407886231419 2015 3.69154228855725 2016 2.35102197485846 2017 4.37839864991561 2018 3.73663882152163 2019 3.90510000865872 2020 5.2267777929352 2021 5.86278242801063 2022 10.3495688391272 2023 6.47413734662063