Year	%
2000	26.44682643778418
2001	26.090924561448308
2002	25.791014362781333
2003	25.623996014146293
2004	25.37501397170523
2005	25.13173489175024
2006	24.9529906280461
2007	24.698308552310802
2008	24.518946711417506
2009	24.27297094435116
2010	23.94796049666338
2011	23.628914007799754
2012	23.282434009421614
2013	23.000281111724416
2014	22.700628045084535
2015	22.47848750599953
2016	22.23955175540927
2017	21.91474927154349
2018	21.61492738194928
2019	21.36472938435143