Year	Percent
1991	25.619
1992	24.723
1993	24.42
1994	24.542
1995	25.557
1996	24.783
1997	25.686
1998	27.267
1999	25.79
2000	25.163
2001	26.683
2002	26.8
2003	26.837
2004	28.134
2005	25.451
2006	26.288
2007	25.623
2008	25.675
2009	29.473
2010	26.01
2011	27.453
2012	26.433
2013	26.508
2014	26.99
2015	26.631
2016	27.421
2017	27.408
2018	27.334
2019	27.242
2020	27.159
2021	27.082
2022	26.999