Year	%
2000	3.23197912976149
2001	3.19232564290581
2002	3.17197077379858
2003	2.77186220836284
2004	2.6671914849082
2005	2.5457408786114
2006	2.48161399813269
2007	2.45178874632406
2008	2.30508690672553
2009	2.26952704259959
2010	2.20587725182095
2011	2.10717876157705
2012	1.88415612436829
2013	1.90374440536556
2014	1.84454697329217
2015	1.6416386800496
2016	1.63547434615255
2017	1.4875798146223
2018	1.45661045489384
2019	1.49111251965762
2020	1.30504082647375