Year	%
2000	24.042319985930085
2001	23.67910064311802
2002	23.62095981761742
2003	23.521311456689325
2004	23.228208629386767
2005	22.62848754792298
2006	21.619270696558722
2007	20.94745346937819
2008	20.625557121890385
2009	20.253884546029973
2010	19.92141672883771
2011	19.50269988896313
2012	19.04519165446458
2013	18.511002876490736
2014	18.230238389311705
2015	17.81580874014912
2016	17.69811194570159
2017	17.298163479424918
2018	17.021675057069096
2019	16.818579016114068