Year	Number
1996	1.75708055496216
1998	1.9069150686264
2000	1.95634055137634
2002	1.93704175949097
2003	1.75373554229736
2004	2.1585156917572
2005	1.84628260135651
2006	2.07526707649231
2007	2.03580713272095
2008	2.02759099006653
2009	1.94502568244934
2010	1.8709591627121
2011	1.86164331436157
2012	1.88282430171967
2013	1.81698524951935
2014	2.10511255264282
2015	1.96786153316498
2016	1.97234451770782
2017	2.01732301712036
2018	1.99700856208801
2019	1.91630423069
2020	1.97250926494598
2021	1.99303758144379
2022	2.04994893074036