Year annual % 1961 1.36446314768822 1962 1.36689936275139 1963 1.36676148477862 1964 1.37137259500941 1965 1.38921968942578 1966 1.39064618349083 1967 1.40104073082651 1968 1.43760928649328 1969 1.46239671352565 1970 1.50343169936696 1971 1.52067222727571 1972 1.57652675666891 1973 1.68876839386097 1974 1.75083342801085 1975 1.78059865882817 1976 1.78375275845561 1977 1.85828164283991 1978 1.9646449801616 1979 2.03128987341685 1980 2.11789974013438 1981 2.1507466362276 1982 2.14707457836595 1983 2.15422011934712 1984 2.09085948882701 1985 1.94301868896015 1986 1.77870413276752 1987 1.66273912237144 1988 1.67505261972126 1989 1.80147050778401 1990 1.92909162423801 1991 1.98072831755334 1992 2.02456219304733 1993 2.08262983645748 1994 2.13645050429572 1995 2.13218653524473 1996 2.10262570856693 1997 2.21953089527186 1998 2.48989782313008 1999 2.75368243522379 2000 2.90782929642605 2001 3.02107830973822 2002 3.13442055916044 2003 3.20676010440896 2004 3.26662811589565 2005 3.30546040144123 2006 3.30569182799157 2007 3.30208691127537 2008 3.28476390707979 2009 3.2555744003116 2010 3.2497394697786 2011 3.23481196285064 2012 2.91810874359862 2013 2.92004450187922 2014 3.17067551792802 2015 3.14674716699948 2016 3.1904414229907 2017 3.21640725807966 2018 3.17485008918529 2019 3.12666991376831 2020 3.14260365885334 2021 3.15796436945004 2022 3.09520925424978 2023 3.05166141549371