Year	Number
1996	1.62061822414398
1998	1.60065186023712
2000	1.5912036895752
2002	1.57331871986389
2003	0.963297605514526
2004	0.877797484397888
2005	0.903781235218048
2006	0.782868325710297
2007	0.744717001914978
2008	0.746175408363342
2009	0.558976113796234
2010	0.577670872211456
2011	0.579870045185089
2012	0.574214994907379
2013	0.548934817314148
2014	0.473154336214066
2015	0.46917524933815
2016	0.474954336881638
2017	0.485498070716858
2018	0.472064346075058
2019	0.468620896339417
2020	0.49604406952858
2021	0.759853065013886
2022	0.752333164215088