Year	%
1996	31.66029
1997	34.78753
1998	31.66029
1999	31.66029
2000	54.98217
2001	32.44298
2002	34.3158
2003	34.72948
2004	34.74808
2005	34.10371
2006	31.01136
2007	28.14805
2008	29.35386
2010	28.63282
2011	33.83272
2012	34.51998
2013	34.20402
2015	28.57312
2016	27.09089
2017	22.24644
2018	22.21086
2020	21.69278
2021	20.09816