Year annual % 1961 2.0137305616902097 1962 0.6650541384618691 1963 4.919829779887493 1964 -0.3665028581218195 1965 2.1672088362046225 1966 2.6449268298169812 1967 2.434226820681104 1968 1.0650990285021322 1969 1.7794617790069651 1970 4.358263178428402 1971 8.232657591742495 1972 6.268776819000436 1973 11.200394489952131 1974 50.10796879462936 1975 2.2629981494588094 1976 6.1935443240511034 1977 8.448427270686636 1978 6.086675328334451 1979 21.945579254879547 1980 28.027239538162405 1981 12.606375912640289 1982 4.28450348163129 1983 3.635256583013799 1984 42.55125659436919 1985 10.420210832766202 1986 -1.1768232399454064 1987 37.44452465439235 1988 18.497659973323238 1989 89.16312358903525 1990 41.7406571272428 1991 21.449616427425838 1992 28.244062356827044 1993 31.645824152682394 1994 62.89068458438993 1995 51.759901832726456 1996 115.52471793332924 1997 33.947459925683006 1998 18.890286702571586 1999 26.19271006155546 2000 29.4528251104893 2001 7.996904056204585 2002 33.0228760786371 2003 34.93375573873692 2004 33.95372433853461 2005 29.60405935129765 2006 17.904315549063583 2007 15.448477757966941 2008 30.132452853435183 2009 7.831666360026659 2010 45.943268698589264 2011 28.149190952885363 2012 14.059430064286076 2013 35.50267463483354 2014 40.44049010655482