Year	Number
1996	1.75904786586761
1998	1.91074895858765
2000	1.89654886722565
2002	2.0240433216095
2003	2.08797860145569
2004	2.28722190856934
2005	2.11490678787231
2006	2.22395443916321
2007	2.34719085693359
2008	2.2413592338562
2009	2.22860789299011
2010	2.10007047653198
2011	2.10107469558716
2012	1.98699104785919
2013	1.94368696212769
2014	1.78538334369659
2015	1.79531025886536
2016	1.82173657417297
2017	1.74644601345062
2018	1.81058418750763
2019	1.87338101863861
2020	1.84041404724121
2021	1.96179676055908
2022	1.9906097650528