Year	Number
1993	4.9891413374542015
1994	4.62818648906047
1995	3.217241789962456
1996	3.0665617956243856
1997	3.1329559174723194
1998	2.767982319687345
1999	3.1895825302901155
2000	3.759131703588849
2001	4.3457373340777545
2002	4.11962694982829
2003	3.3190312535657727
2004	2.937215315306027
2005	2.642404143428561
2006	3.647845408240453
2007	3.370486910290742
2008	2.93236592374859
2009	7.174673806674256
2010	6.341260801090105
2011	3.876628242058645
2012	4.376140635048902
2013	4.44245991968724
2014	1.7787073678086884
2015	2.2315653282316017
2016	2.3059630803998092
2017	2.6563299803556646
2018	2.21518199927928
2019	2.3466872673977606
2020	2.883803328267802
2021	2.2584644298414607
2022	1.5810210152442217
2023	1.7722365317893551