Year	Number
1996	1.71154367923737
1998	1.77015435695648
2000	1.65919423103333
2002	1.91511082649231
2003	1.86878955364227
2004	1.85430920124054
2005	1.70650970935822
2006	1.74316394329071
2007	1.60233938694
2008	1.38118207454681
2009	1.56746017932892
2010	1.65420985221863
2011	1.72347581386566
2012	1.67117416858673
2013	1.70255434513092
2014	1.5182546377182
2015	1.53023040294647
2016	1.39854896068573
2017	1.24059319496155
2018	1.22472155094147
2019	1.11346733570099
2020	1.07878303527832
2021	1.08703339099884
2022	1.22765874862671