Year	Percent
1991	4.852
1992	4.96
1993	4.93
1994	5.038
1995	5.243
1996	5.294
1997	5.627
1998	5.022
1999	5.745
2000	7.146
2001	8.729
2002	8.844
2003	8.939
2004	8.944
2005	8.752
2006	8.978
2007	8.797
2008	8.085
2009	12.057
2010	16.972
2011	20.84
2012	24.864
2013	25.418
2014	26.298
2015	27.345
2016	27.921
2017	28.109
2018	28.284
2019	28.51
2020	28.698
2021	28.9
2022	28.999