Year	Number
1995	1.5515759049867763
1996	1.1338701412242733
1997	1.2291336515382378
1998	1.0454231635555093
1999	1.185047007813881
2000	0.9621381461050196
2001	1.1721729702306944
2002	0.8643154105013251
2003	1.089902871045402
2004	1.7799099153022766
2005	1.9854940926713136
2006	1.9474394913570237
2007	1.958375532530394
2008	2.4509440731530057
2009	2.0453128922210806
2010	2.0423446042892914
2011	1.5771275521104142
2012	1.7553833629721207
2013	1.7283572367939601
2014	1.7032734802678968
2015	1.3194177862596719
2016	1.3858854463177825
2017	1.1826542914548444
2018	1.2113504503159902
2019	0.6270523232605146
2020	0.6372006318041671
2021	0.6681608405160032