Year	%
2000	27.320937854431808
2001	26.839224285815405
2002	26.611405400394144
2003	26.433498787448425
2004	26.35944518029387
2005	25.826344107602143
2006	24.967894755713257
2007	24.531329211437264
2008	24.322894571458754
2009	24.06973040352078
2010	23.87614871407063
2011	23.58117952804956
2012	23.272636001653435
2013	22.84394231164942
2014	22.417931141769376
2015	22.167785418753564
2016	21.996003296603078
2017	21.5083533559048
2018	21.19347161515069
2019	20.972929141612678