Year	Number
1998	1.672470370041864
1999	1.2720760965037876
2000	0.7542268434045184
2001	0.9016221068865042
2002	1.1845862947276076
2003	1.2783920797136883
2004	1.2754542449700392
2005	1.7683517895782945
2006	2.2510267111721114
2007	9.297079198129573
2008	4.761734871380245
2009	3.5595737810926957
2010	2.525657978643838
2011	2.4798392016122928
2012	2.373702538341065
2013	2.6952770919871636
2014	3.591938096632143
2015	3.5482690016668204
2016	2.9271099706617254
2017	1.6311668148842065
2018	1.6122010050208513
2019	1.5853781421436675
2020	1.1363091356556305
2021	1.0050177820909365
2022	0.6185816593372784