Year annual % 1960 2.266870991627855 1961 3.10525014675917 1962 2.076695284115665 1963 2.514760284207815 1964 3.679118848912195 1965 2.745932487985615 1966 2.87319422160326 1967 2.55439473084728 1968 3.253567409415905 1969 2.44186116813624 1970 4.303903352014615 1971 4.313935621080095 1972 5.1856976800431305 1973 13.190707015633851 1974 23.244048532597247 1975 14.9445346409267 1976 9.79365327534651 1977 10.6889574207751 1978 10.507959934318599 1979 14.8423081655328 1980 18.135170796071 1981 13.6573280826891 1982 7.729492239113185 1983 10.9128872185399 1984 11.72729825880865 1985 20.5075831762827 1986 16.89666805447005 1987 14.064711115850649 1988 13.4173974119652 1989 14.751503572715201 1990 22.6413707765775 1991 25.096407309349303 1992 13.626533683000499 1993 11.28416844549885 1994 12.194894938390899 1995 12.9806869102685 1996 11.2974294718582 1997 7.720839578379875 1998 6.930641228657625 1999 5.036029042518935 2000 7.06991352252517 2001 6.8019093078759 2002 5.22336769759447 2003 5.60347675434469 2004 5.90402005546502 2005 5.05101962689696 2006 4.28239604802561 2007 6.14356655248047 2008 10.0662418245849 2009 2.59194673430567 2010 3.8595090983317 2011 5.1289237668161 2012 4.11150981070289 2013 2.76789666082002 2014 3.43816659958601 2015 3.12900274473925 2016 2.72461223295289 2017 3.27955694678546 2018 2.7823570914924503 2019 2.17408413342917 2020 2.00241205759292 2021 4.26105127422813 2022 8.27477490232654 2023 4.6127928384328