Year annual % 1961 4.37340043959567 1962 5.788937790374348 1963 6.416694480291099 1964 2.352436518991553 1965 4.117855660964878 1966 5.947590673507676 1967 5.939890526600109 1968 4.760156243867073 1969 6.876317102877593 1970 8.644504446693361 1971 16.902087154494268 1972 10.975676049010644 1973 21.93021870169764 1974 28.992347354604533 1975 21.30924006828876 1976 15.612657491485876 1977 24.08902324503515 1978 47.54114671024158 1979 76.72086671894013 1980 93.00322479164137 1981 44.05707049669786 1982 28.226834400707673 1983 26.25824541614263 1984 48.23683260720756 1985 53.05447687450496 1986 36.00688555044317 1987 33.61222903314581 1988 69.0181311101417 1989 75.40483061226965 1990 58.244398106674566 1991 59.16410689093357 1992 65.19943827697949 1993 68.37942835598122 1994 104.74913721512232 1995 86.00754244181695 1996 77.22351221670604 1997 81.4548625820616 1998 143.63966161467295 1999 54.279958304052144 2000 49.360776243032376 2001 52.97976068020432 2002 37.57482083171212 2003 23.289280989382206 2004 12.42751107542395 2005 7.08541612916396 2006 9.376206363527075 2007 6.199758202537396 2008 12.04615359392804 2009 5.446449103198887 2010 7.009283602597407 2011 8.200847093306507 2012 7.42267328660553 2013 6.280109697081798 2014 7.389518637703034 2015 7.844916930102627 2016 8.130478078144506 2017 10.982421668328456 2018 16.512279461502672 2019 13.867735252289393 2020 14.789375741225115 2021 28.9730164131403 2022 96.03611496399125 2023 67.47341540334938