Year	Percent
1991	27.723
1992	27.504
1993	27.801
1994	28.234
1995	27.698
1996	28.295
1997	27.512
1998	28.06
1999	27.639
2000	26.553
2001	26.421
2002	24.23
2003	27.079
2004	28.33
2005	27.589
2006	26.373
2007	26.653
2008	25.029
2009	22.625
2010	23.263
2011	22.727
2012	22.706
2013	21.494
2014	22.316
2015	23.317
2016	23.099
2017	22.957
2018	23.289
2019	23.533
2020	23.817
2021	24.067
2022	24.17