1993.0 0.8
1994.0 0.8
1995.0 1.0
1996.0 0.9
1997.0 0.7
1998.0 0.9
1999.0 0.7
2000.0 0.8
2001.0 0.8
2002.0 1.2
2003.0 1.8
2004.0 2.5
2005.0 2.2
2006.0 1.4
2007.0 1.3
2008.0 1.3
2009.0 0.8
2010.0 0.6
2011.0 0.3
2012.0 0.3
2013.0 0.3
2014.0 0.2
2015.0 0.2
2016.0 0.1
2017.0 0.1
2018.0 0.1
2019.0 0.1