Year	%
2000	20.659960522637576
2001	20.018044077258068
2002	19.60481149256767
2003	19.25086562906019
2004	18.384672210670132
2005	18.08244427608566
2006	17.533054916785822
2007	17.24389043515018
2008	16.800571620136502
2009	16.6119889555412
2010	16.290624859125412
2011	15.963661893033557
2012	15.750860153796301
2013	15.426764625183091
2014	14.944296878298369
2015	15.010370007474839
2016	14.664274966666733
2017	14.40720240589812
2018	14.225666399188203
2019	13.979669684418889