Year % 1987 6.475434269927614 1988 6.918180040996287 1989 6.264234020363807 1990 4.566640858804425 1991 4.791125219109303 1992 6.528137587728988 1993 5.03292510547116 1994 4.056926123650992 1995 6.988250527436051 1996 6.890905449416477 1997 6.3119525191328085 1998 4.173555703148995 1999 10.716899407741916 2000 10.917450076099135 2001 15.885948876167978 2002 6.573785003129433 2003 7.424575074628508 2004 6.604509536379493 2005 5.646372976168208 2006 5.813105098236745 2007 4.97600231726435 2008 5.9825479431511015 2009 8.846046570198206 2010 11.666130758596305 2011 4.80197433814387 2012 8.200875006844758 2013 10.709708765544137 2014 3.2138688203128223 2015 0.15792476968270958 2016 7.982851709797359 2017 9.789286656651138 2018 2.4376818332472023 2019 -0.37156363497291556 2020 7.738754308753697 2021 11.988409882721374 2022 2.5984758654094966