Year annual % 1961 13.459847596717466 1962 11.888924765902487 1963 2.0604871291700335 1964 12.650568342475824 1965 15.597389558232933 1966 22.278195162200895 1967 14.003622545015448 1968 16.083769470404985 1969 12.235792768623153 1970 12.931259160782647 1971 16.505347715298075 1972 23.2888089266892 1973 22.75101008388745 1974 20.307812428137535 1975 15.805275744908512 1976 20.481100071021256 1977 19.472314805475012 1978 19.098305243070048 1979 14.427639077497473 1980 22.286796160186718 1981 15.753747782661481 1982 23.329155329252174 1983 23.77239182183492 1984 19.67065372685269 1985 11.464676689956015 1986 13.623721207396382 1987 19.43218545942907 1988 17.9626159279414 1989 26.177135922209903 1990 25.51905533187514 1991 19.39550519333683 1992 15.513675662488385 1993 18.990956464593182 1994 10.68609629870347 1995 17.74273167102772 1996 10.620175603965 1997 19.550542282104395 1998 10.06961338433115 1999 3.7991228161153736 2000 4.907951430929565 2001 16.377198027382285 2002 1.3058949989461215 2003 6.245641937771046 2004 5.792798146671611 2005 6.096479293714574 2006 8.155196702477545 2007 6.252973594885656 2008 9.164783278233154 2009 6.764416832062409 2010 10.94290509556978 2011 15.120968015800571 2012 10.375447818997312 2013 7.320850314823771 2014 4.647849566461771 2015 4.435636486600485 2016 4.221786503047914 2017 5.012770999427244 2018 4.667547638502581 2019 3.636896985192626 2020 10.15991613852399 2021 4.8051093260099345 2022 3.875771904016049 2023 1.950480913188441