Year annual % 1961 2.3772095927017 1962 2.42339776122522 1963 2.4562697215754 1964 2.45403322000064 1965 2.44424602830767 1966 2.4558892931876 1967 2.47458990849895 1968 2.47548273915517 1969 2.45475377681516 1970 2.45755365270015 1971 2.50533486469394 1972 2.57075175507162 1973 2.6417706205907 1974 2.72384135078628 1975 2.81850032725728 1976 2.93440585733785 1977 3.14029375768281 1978 3.45198882880024 1979 3.72286497273106 1980 3.87522690203158 1981 3.95010086514018 1982 3.97603889382417 1983 3.9588590872096 1984 3.8996228261836 1985 3.82396858697708 1986 3.66623471410976 1987 4.76677280562866 1988 5.38273240006619 1989 4.68709985860626 1990 3.89874198061952 1991 3.0141691007144 1992 2.84609317022241 1993 1.39221230120606 1994 -1.23042214550306 1995 -0.187536345478363 1996 1.93619787814188 1997 1.94164482465729 1998 2.06904640317321 1999 2.22524077408069 2000 2.30093521781424 2001 2.3710066148072 2002 2.45406914818211 2003 2.54253905729233 2004 2.64004024351051 2005 2.736342194188 2006 2.80345816457226 2007 2.83448193292953 2008 2.87740603419066 2009 2.90572339354206 2010 2.89150573052371 2011 2.86427704641241 2012 2.83256555379816 2013 2.80676296771096 2014 2.78881323875244 2015 2.75911370133102 2016 2.71781408401004 2017 2.69546636843743 2018 2.68556142714987 2019 2.68285756018368 2020 2.66577178304392 2021 2.61141776637435 2022 2.5591382705715 2023 2.54716886319793