Year	Percent
1998	22.20491
1999	23.11314
2000	22.28217
2001	22.79092
2002	23.48252
2003	24.09947
2004	23.63853
2005	21.84876
2006	23.6925
2007	21.40784
2008	23.09172
2009	23.94258
2010	22.83465
2011	21.51857
2012	20.68535
2013	21.39244
2014	21.19211