Year	%
2000	31.35278207029964
2001	31.05198526610129
2002	30.77506715847968
2003	30.444935999097222
2004	29.994578227568017
2005	29.575245660573206
2006	29.250659828654104
2007	28.879852226497377
2008	28.47955080439062
2009	28.105064052192542
2010	27.805058656905565
2011	27.604419662510384
2012	27.518721377534188
2013	27.466618286726376
2014	27.43023060136055
2015	27.41052350751001
2016	27.504759229645433
2017	27.579020353039187
2018	27.67864729491103
2019	27.756548664090325