Year	%
2000	24.618207340654497
2001	24.620766837270114
2002	24.375628780821554
2003	24.258678654797357
2004	24.09430229914757
2005	23.84656866810523
2006	23.703556862382218
2007	23.53399610245539
2008	23.25977599724463
2009	22.972857711766927
2010	22.758297823960483
2011	22.59555384584467
2012	22.413928527980016
2013	22.089444406895012
2014	21.70161372001985
2015	21.375999094540642
2016	21.053272248601495
2017	20.65843080863151
2018	20.352431351574594
2019	20.112572328657706