Year	Percent
1991	7.228
1992	6.952
1993	6.709
1994	7.97
1995	9.333
1996	8.822
1997	10.026
1998	10.334
1999	9.871
2000	11.695
2001	13.339
2002	12.1
2003	10.869
2004	9.153
2005	9.359
2006	9.51
2007	9.869
2008	9.833
2009	9.109
2010	9.051
2011	8.77
2012	8.919
2013	8.588
2014	8.768
2015	9.206
2016	9.393
2017	8.905
2018	9.224
2019	9.476
2020	9.637
2021	9.489
2022	9.454