Year annual % 1961 2.743680193178072 1962 3.0301826326870582 1963 2.993337800959381 1964 3.367772317373344 1965 2.3623121214866316 1966 3.59364081326936 1967 3.2996803947004167 1968 3.6715761871467834 1969 3.5928369461449847 1970 4.272866907501246 1971 5.38437111275978 1972 6.786658893773364 1973 14.676270875082764 1974 23.21302672283305 1975 15.469143574133184 1976 8.5989208742604 1977 12.54061842900343 1978 8.826450626120135 1979 14.614460950144093 1980 18.288010784912757 1981 10.808355639461325 1982 7.08276256147326 1983 7.027936497908826 1984 10.48300205820695 1985 9.360922047807641 1986 7.263041172770208 1987 9.326562618516519 1988 11.655297949067872 1989 10.908896874544595 1990 18.54790029917801 1991 14.610258813735683 1992 5.56829005918074 1993 8.811785022604184 1994 11.72227820328051 1995 10.508667229749122 1996 3.930579753464599 1997 3.7042377527197345 1998 5.37109035742958 1999 3.8341544024193865 2000 4.56004348689325 2001 3.323426763715524 2002 3.718247590085099 2003 4.718566729448568 2004 6.451983851607594 2005 5.940797630219279 2006 6.1071543478173 2007 6.226084643335724 2008 7.602438982606891 2009 3.53797080152426 2010 4.655701382503423 2011 5.659653514985365 2012 3.5982212444109507 2013 2.5216756937049496 2014 2.5046100402686733 2015 2.78817037438111 2016 2.1019411183078773 2017 2.85888372957956 2018 2.277415317621333 2019 2.9611884630726735 2020 1.4817246203753882 2021 4.605728088887929 2022 6.470499208910873 2023 4.697411400987569