Year	%
2000	6.67002937381091
2001	6.74826368304065
2002	6.69668325768878
2003	6.63528025177348
2004	6.19584954487726
2005	5.95251706890751
2006	5.71346738449495
2007	5.49088271008791
2008	5.25844881762399
2009	5.05019709617585
2010	4.47612803473771
2011	4.34560678883282
2012	4.23558140846464
2013	4.05606623978562
2014	3.88912773527811
2015	3.72965478621152
2016	3.56781206518048
2017	3.16107286015537
2018	3.1519974970756
2019	2.99756232566374
2020	3.21741712168578