Year	Number
1996	1.56321668624878
1998	1.52875912189484
2000	1.53565549850464
2002	1.43712818622589
2003	1.42226195335388
2004	1.56307661533356
2005	1.52818155288696
2006	1.32997930049896
2007	1.30550646781921
2008	1.32532179355621
2009	1.32293725013733
2010	1.32430839538574
2011	1.36045336723328
2012	1.43383765220642
2013	1.40664172172546
2014	1.16596496105194
2015	1.19449520111084
2016	1.17659735679626
2017	1.16165626049042
2018	1.04732167720795
2019	1.10841190814972
2020	1.08625340461731
2021	1.03341281414032
2022	1.10283291339874