Year	Number
1996	1.62873435020447
1998	1.73309910297394
2000	1.66714358329773
2002	1.65189230442047
2003	1.6673995256424
2004	1.60760021209717
2005	1.55816102027893
2006	1.77239453792572
2007	1.72019219398499
2008	1.69664943218231
2009	1.73159778118134
2010	1.77469253540039
2011	1.65874373912811
2012	1.72941386699677
2013	1.68943524360657
2014	1.87480342388153
2015	1.77103567123413
2016	1.64045774936676
2017	1.64431941509247
2018	1.60294651985168
2019	1.56944584846497
2020	1.46293222904205
2021	1.3965802192688
2022	1.41549122333527