Year	%
2000	25.38640566642266
2001	24.8887617995963
2002	24.681485798867204
2003	24.556060176127986
2004	24.36794373186551
2005	24.12676182311069
2006	23.965473277211576
2007	23.6032394968216
2008	23.503838608913025
2009	23.221485619546808
2010	22.849866020146425
2011	22.46024999635173
2012	21.952536836454108
2013	21.67718725431397
2014	21.48282423176301
2015	21.331573965294808
2016	21.1462076876618
2017	20.83831081316203
2018	20.467890807770015
2019	20.26533667898983