year,value
1979,8.680955556
1980,-4.641044444
1981,2.389955556
1982,-13.61904444
1983,-3.586044444
1984,-9.665044444
1985,-16.40904444
1986,-9.168044444
1987,-4.547044444
1988,-1.473044444
1989,5.275955556
1990,-1.769044444
1991,5.000955556
1992,-26.45804444
1993,2.814955556
1994,-5.429044444
1995,9.468955556
1996,-17.11304444
1997,0.109955556
1998,0.140955556
1999,-11.67804444
2000,-10.69804444
2001,-11.14604444
2002,5.256955556
2003,3.826955556
2004,1.818955556
2005,6.511955556
2006,-1.533044444
2007,-2.692044444
2008,-8.928044444
2009,1.279955556
2010,1.791955556
2011,0.073955556
2012,-7.694044444
2013,-0.641044444
2014,11.61895556
2015,9.294955556
2016,22.59995556
2017,10.16895556
2018,14.62595556
2019,18.92595556
2020,9.317955556
2021,1.002955556
2022,9.138955556
2023,7.749955556