Year annual % 1961 2.9900634646976556 1962 2.010371570425008 1963 3.0139171557781737 1964 3.0262739690583658 1965 2.994578299800324 1966 3.6610668045652375 1967 1.9796306042064842 1968 2.1927423748959995 1969 3.5893560890203275 1970 3.960561146989278 1971 4.458444375608977 1972 5.950279211573843 1973 12.575532138610797 1974 17.72789836381361 1975 9.618618619938331 1976 9.332911656274511 1977 10.576355851607616 1978 8.982345695884234 1979 12.234918149740494 1980 13.898534825435256 1981 9.577975179868133 1982 8.11308950866379 1983 8.896133652392066 1984 10.17720449894518 1985 7.934208584016588 1986 6.569952894922309 1987 9.327893305982442 1988 9.069183859634776 1989 8.71587422051305 1990 10.69209450169415 1991 13.751818940881662 1992 11.915633250761104 1993 11.297973858390549 1994 17.191302909356736 1995 10.986411961136227 1996 9.074834888785134 1997 7.006173042026262 1998 6.840405748946694 1999 6.837045117830158 2000 7.877580765541936 2001 5.826618943435307 2002 4.698928162019669 2003 5.759740766556746 2004 7.126841555053915 2005 7.026790842590074 2006 7.80012735973601 2007 7.095515787762906 2008 9.372730255634679 2009 3.023044970584948 2010 6.512003689056684 2011 8.190798598622422 2012 4.85594551850788 2013 3.621296542024794 2014 3.1924061125192793 2015 2.9278993647316653 2016 3.007716601570074 2017 4.055265402608811 2018 3.61211059645764 2019 3.0849408344592746 2020 2.8293010224794486 2021 5.834887886910089 2022 8.330903988542886 2023 5.001720394876031