Year	Number
1993	5.255667004413426
1994	4.197812841040608
1995	2.7994245937007896
1996	3.2534602775255266
1997	3.6930166442818955
1998	2.9795879682843127
1999	2.7868391887191795
2000	2.8501227365777693
2001	2.9215188872957305
2002	1.841154653490668
2003	2.0026933843830936
2004	2.2359000043289763
2005	2.562975800663188
2006	2.8836511421701956
2007	3.359717521209253
2008	4.277328874547166
2009	3.4155616603529024
2010	3.401724018752794
2011	3.9784137817017617
2012	3.381977250745128
2013	2.8580994325894085
2014	2.9444173035604084
2015	2.266473214440985
2016	1.8281512717406596
2017	1.2219470404807589
2018	1.4510826336875418
2019	1.3907625831400028
2020	1.362939384160888
2021	1.490813798685801
2022	1.8209247088530807
2023	1.9834333013273553