Year	Number
1996	1.85839378833771
1998	1.85049915313721
2000	1.79541397094727
2002	1.79115116596222
2003	1.84832954406738
2004	1.84883081912994
2005	1.84639847278595
2006	1.79479086399078
2007	1.82681655883789
2008	1.85065972805023
2009	1.92267489433289
2010	1.86188757419586
2011	1.89464735984802
2012	1.88321006298065
2013	1.87015104293823
2014	2.00416088104248
2015	1.96550953388214
2016	1.91391754150391
2017	1.8833794593811
2018	1.83372128009796
2019	1.84366428852081
2020	1.83871698379517
2021	1.78184449672699
2022	1.73179721832275