# year    value 
 1980     0.84 
 1981    -1.42 
 1982    -0.47 
 1983     0.72 
 1984    -0.07 
 1985    -1.92 
 1986    -0.32 
 1987    -1.15 
 1988     1.96 
 1989     1.21 
 1990     2.11 
 1991    -0.63 
 1992     0.05 
 1993     0.33 
 1994     1.76 
 1995     1.82 
 1996    -0.21 
 1997     0.59 
 1998     2.26 
 1999    -0.11 
 2000     0.73 
 2001     2.17 
 2002     0.46 
 2003    -0.37 
 2004     0.57 
 2005    -0.38 
 2006    -0.98 
 2007     3.23 
 2008     1.59 
 2009     0.03 
 2010    -0.16 
 2011     0.04 
 2012     0.03 
 2013     0.17 
 2014     2.69 
 2015     1.46 
 2016     2.76 
 2017     0.32 
 2018     1.01