Year	%
2000	28.545808153627853
2001	28.153237028185906
2002	27.872281659500768
2003	27.6381445698893
2004	27.30215964133414
2005	26.850030353778138
2006	26.36493015581673
2007	25.80461448952033
2008	25.211061367951636
2009	24.613543405221563
2010	24.051256651210384
2011	23.566521527492107
2012	23.133873303335385
2013	22.77217679390855
2014	22.50585349801411
2015	22.266012504535656
2016	22.068018576192312
2017	21.968236901220383
2018	21.87959194401144
2019	21.85005973101562