Year	Percent
1991	5.672
1992	5.758
1993	6.037
1994	6.112
1995	7.008
1996	7.472
1997	7.844
1998	8.07
1999	8.363
2000	8.597
2001	8.729
2002	9.066
2003	9.462
2004	12.201
2005	16.625
2006	22.327
2007	17.893
2008	17.092
2009	17.948
2010	27.332
2011	23.045
2012	16.538
2013	23.413
2014	24.73
2015	24.323
2016	25.581
2017	25.461
2018	26.812
2019	27.758
2020	27.116
2021	26.772
2022	27.556