Year annual % 1961 3.37630049543017 1962 3.2669535162312 1963 3.14670218463675 1964 3.0013095765307 1965 2.85482669470742 1966 2.71499927819589 1967 2.58873498288491 1968 2.46366022335437 1969 2.2219668730002 1970 1.83343122530565 1971 1.44911954404308 1972 1.33827634632251 1973 1.4013938984731 1974 1.4169058202479 1975 1.42700265272311 1976 1.4128149554318 1977 1.46786009087645 1978 1.5151709533384 1979 1.49781460442122 1980 1.52801509654529 1981 1.57287250765573 1982 1.63128105647953 1983 1.70590697338369 1984 1.74225534840213 1985 1.73903028550651 1986 1.97840348459854 1987 2.20925871402086 1988 2.20364730901752 1989 -1.10827022537126 1990 0.60434266304362 1991 0.632391825851526 1992 -0.0767144509545815 1993 -0.356023622657981 1994 -1.44442551102409 1995 -2.06203981757278 1996 -1.51632157147922 1997 -1.57752375406098 1998 -1.72841644846206 1999 -0.955113481670914 2000 -0.300201486690526 2001 -0.170069526322763 2002 0.00412554539450457 2003 0.336408913793247 2004 0.694909484311257 2005 0.888898042702025 2006 1.05767130866502 2007 1.14385123349431 2008 1.87296209612182 2009 1.98240805691531 2010 1.41327147745347 2011 1.43151244887822 2012 1.40867688701824 2013 1.43944535624798 2014 1.47267087305755 2015 1.46148468519161 2016 1.42204614032925 2017 1.36038126908993 2018 1.31452298457883 2019 1.28960848954226 2020 1.29863532544565 2021 2.29640758923114 2022 2.28528529025291 2023 1.34158039345206