Year	Number
1996	1.8773558139801
1998	1.79812967777252
2000	1.86208832263947
2002	1.76143634319305
2003	1.89528703689575
2004	2.00586891174316
2005	1.94266772270203
2006	1.95081317424774
2007	2.00087285041809
2008	2.0273425579071
2009	2.04176306724548
2010	2.02361083030701
2011	2.03790903091431
2012	1.97750723361969
2013	1.77787029743195
2014	1.84946465492249
2015	1.84135389328003
2016	1.77200365066528
2017	1.75232112407684
2018	1.76737761497498
2019	1.78817307949066
2020	1.63295590877533
2021	1.7076461315155
2022	1.76448953151703