Year	Number
1996	1.6200632355785816
1997	1.6706569315751205
1998	1.6802197632316531
1999	2.814992036010506
2000	2.264214572321003
2001	2.3551133617428874
2002	2.213041256880848
2003	2.6948395530783276
2004	2.442831087432534
2005	2.6536574396688026
2006	3.224640078461908
2007	4.075098435753439
2008	3.2145837344250054
2009	2.5741838437419102
2010	1.6205473420162577
2011	1.4173501296534001
2012	2.4870282253899703
2013	2.146521567858211
2014	2.5363346850976494
2015	1.850372579375202
2016	2.2239853292741345
2017	2.4629013878470802
2018	2.5295799110110133
2019	3.3667935294008653
2020	3.9782956088745958
2021	3.686074294957552
2022	2.65055544761863