Year annual % 1961 9.74940091106726 1962 11.7741483431464 1963 12.1452665327548 1964 12.1479173290754 1965 11.9645030573634 1966 11.988676262946 1967 12.1148606556543 1968 11.9831691598214 1969 11.6513713282501 1970 12.1394207140241 1971 12.0326727617361 1972 10.842278131997 1973 9.87497061403604 1974 9.08116435329216 1975 8.41652437241879 1976 7.85906919131554 1977 7.39187103402489 1978 6.98966038219543 1979 6.64699617680189 1980 6.35447218536517 1981 6.0951495337736 1982 5.83577773608858 1983 5.55174570783728 1984 5.24273022738307 1985 4.93778437890037 1986 4.4006266318923 1987 3.86418037237576 1988 3.64472675076002 1989 3.51724736821493 1990 3.40338936545745 1991 3.29837139389487 1992 3.19219498461522 1993 3.0813001198281 1994 2.9680183810828 1995 2.84519534565487 1996 2.70641318572318 1997 3.95029951636012 1998 5.37533465570568 1999 5.41118803460242 2000 5.18445021336724 2001 4.96702253375353 2002 4.93700548143404 2003 4.83623474765467 2004 3.85486532773939 2005 8.70642929198329 2006 17.898545339652 2007 19.360428664312 2008 15.9056839638554 2009 10.8795500522929 2010 6.21360458813461 2011 5.15608097721193 2012 5.47271987641268 2013 6.59135749712435 2014 8.42688590935528 2015 8.65116205432081 2016 7.21280238660749 2017 4.39455430208811 2018 2.00708135491804 2019 1.45331728352711 2020 -1.68298503942558 2021 -2.64853183197257 2022 0.255862791830044 2023 0.786068869030495