Year	%
1993	25.49277
1994	27.05538
1995	28.04575
1996	28.36527
1997	27.90198
1998	26.69809
1999	38.39831
2000	23.84018
2001	24.19493
2002	28.71268
2003	27.29278
2004	26.3904
2005	27.5572
2006	22.36928
2007	30.94201
2008	27.26445
2009	23.5193
2010	24.88922
2011	22.25933
2012	20.25389
2014	20.99778
2015	20.98619
2016	22.39427
2017	19.50292
2018	20.74517
2019	20.97732
2020	19.42076
2021	18.13635