Year annual % 1961 6.099478160913478 1962 21.240771966504667 1963 87.84920130406132 1964 3.54797755518112 1965 38.95212151121402 1966 4.9738205992076985 1967 58.57441034349691 1968 59.88278485384217 1969 17.731061833850177 1970 -2.8369488996937093 1971 8.203696788612575 1972 10.18139845976016 1973 17.88704948787378 1974 18.238322992893984 1975 12.265417976400613 1976 57.395428383235696 1977 37.271648730266406 1978 28.41429852009253 1979 101.77003624382758 1980 51.4075541678595 1981 33.230222110794614 1982 43.485283559513334 1983 78.21547289885115 1984 89.60322155742065 1985 25.81090939356254 1986 28.4532565060463 1987 73.76739788942862 1988 91.58618549210354 1989 110.26224798857652 1990 108.95530711449663 1991 2338.449670144185 1992 3855.307641070577 1993 1657.6415886577233 1994 26765.858251885493 1995 466.4073586275497 1996 638.1888243458782 1997 192.6428345357138 1998 26.935376360347732 1999 441.9024918753521 2000 2630.122674422399 2001 73.05971136152704 2002 31.719461228940474 2003 13.415453520497309 2004 6.365458262661122 2005 29.86954662225739 2006 13.325225383839424 2007 20.2714649760467 2008 20.465316617956717 2009 32.65792915526731 2010 20.786325148869338 2011 13.79166010675496 2012 5.939992211939355 2013 2.771291414554298 2014 0.9936306669717396 2015 -1.155878592870124 2016 4.349228944758792 2017 43.068659764167705 2018 30.998612148703018 2019 5.8954053744032535 2020 3.9015495706452725 2021 14.975434553120891 2022 10.106417235373783 2023 13.17193122185654