Year	%
2000	4.53362308427762
2001	4.37442379662555
2002	4.44884227131124
2003	4.72008753592587
2004	4.13111508449636
2005	4.00263570158551
2006	3.9331481037198
2007	3.93046347398182
2008	3.54498342385846
2009	3.58055704400582
2010	3.34695854756955
2011	3.39834968162577
2012	3.40190818933219
2013	3.12721632769082
2014	3.81853173622268
2015	3.15097692921519
2016	2.90217699270567
2017	3.05810269015117
2018	3.17070498621899
2019	2.87616670953053
2020	2.81978851524495