# year    value 
 1980     0.83 
 1981    -1.37 
 1982    -0.55 
 1983     0.69 
 1984    -0.07 
 1985    -2.01 
 1986    -0.35 
 1987     -1.2 
 1988     1.95 
 1989     1.19 
 1990     2.08 
 1991    -0.69 
 1992     0.06 
 1993     0.28 
 1994      1.7 
 1995     1.81 
 1996    -0.29 
 1997     0.52 
 1998     2.18 
 1999    -0.12 
 2000     0.74 
 2001     2.08 
 2002     0.41 
 2003    -0.44 
 2004     0.56 
 2005     -0.4 
 2006    -0.99 
 2007     3.18 
 2008     1.53 
 2009    -0.01 
 2010    -0.22 
 2011    -0.03 
 2012     0.06 
 2013     0.15 
 2014     2.64 
 2015     1.43 
 2016     2.72 
 2017     0.32 
 2018     0.97