Year	%
2000	38.76517209288608
2001	38.49934367022286
2002	38.30396521392462
2003	38.14696820224101
2004	37.88978060623893
2005	37.60615715804132
2006	37.25327221078626
2007	36.89930538631901
2008	36.49288079115561
2009	36.02331082768147
2010	35.63316753677429
2011	35.2498435453281
2012	35.027051015292265
2013	34.890633265000425
2014	34.723579919548136
2015	34.4872910381767
2016	34.3488748859938
2017	34.26464811871832
2018	34.20774690729382
2019	34.16650447277205