Year annual % 1961 2.82267242591856 1962 2.72326137725998 1963 2.58935367356987 1964 2.62811450987422 1965 2.68830068824992 1966 2.69736434576469 1967 2.66363350822576 1968 2.60802658859395 1969 2.5153138989545 1970 2.46533907925573 1971 2.42727315509449 1972 2.40079667221047 1973 2.407010019843 1974 2.37252273513685 1975 2.30017088091472 1976 2.18696065510656 1977 2.13240230717282 1978 2.08820077924978 1979 1.97098194679037 1980 1.69878206722071 1981 0.887183299301569 1982 1.10899755109898 1983 1.93289161411517 1984 1.95403148720498 1985 1.95757850487843 1986 1.90979290744089 1987 1.92100179537841 1988 2.01693944797354 1989 1.92291055087378 1990 1.81155478135323 1991 1.73422966487922 1992 1.65505850095383 1993 1.40894113586898 1994 1.09592871892721 1995 0.964186767423198 1996 0.847880000384356 1997 0.781771468899008 1998 0.723843708853884 1999 0.656606870781475 2000 0.582883767568532 2001 0.4957580845353 2002 0.386354097488165 2003 0.258744779316872 2004 0.14600619513778 2005 0.035814056190455 2006 -0.0560127440734922 2007 0.160532322783851 2008 0.395765788534978 2009 0.379776014021418 2010 0.374364787171041 2011 0.380610550595593 2012 0.389311893511473 2013 0.394479107083525 2014 0.385376455719377 2015 0.346286117647337 2016 0.311563471293443 2017 0.257949946994399 2018 0.154476680476382 2019 0.0617207329334854 2020 0.199062369975812 2021 0.340068122361035 2022 0.351368233858255 2023 0.449575546018594