1996#18.5
1997#7.7
1998#4.9
1999#8
2000#5.6
2001#8.2
2002#9.8
2003#14.1
2004#7.8
2005#7.4
2006#6.8
2007#6.4
2008#8.8
2009#7.3
2010#8.4
2011#8.3
2012#7.9
2013#7.5
2014#7.8
2015#7.6
2016#8.1
2017#3.8
2018#4.4
2019#4.3
2020#6.5
2021#13
2022#8.6
2023#5.2
