Year	Number
1993	2.082074156206238
1994	2.7294786034884937
1995	2.508353497115394
1996	1.9677170912210575
1997	2.1561306297788705
1998	2.8670912646288156
1999	2.9249635772167553
2000	2.9497708188389553
2001	3.1716199767078987
2002	3.8900207070974906
2003	4.179943901626619
2004	3.1604284442140225
2005	2.6435259776532005
2006	3.1640588046489957
2007	3.2567737872342395
2008	2.124959429120592
2009	3.9183046006109095
2010	3.033142761185164
2011	2.7472138955052348
2012	2.855701206087826
2013	2.533113292800312
2014	2.907827280161839
2015	0.6480996946555945
2016	0.9973137651075052
2017	1.4483684507386207
2018	1.632846986558641
2019	1.433038708161954
2020	1.4769963050656618
2021	1.229585850564264
2022	0.9646478613996393
2023	1.1737892193029762