Year	Percent
1991	5.876
1992	6.104
1993	5.83
1994	6.012
1995	6.284
1996	6.243
1997	6.371
1998	6.879
1999	7.464
2000	7.545
2001	7.363
2002	6.865
2003	6.839
2004	6.673
2005	6.605
2006	6.699
2007	6.686
2008	6.706
2009	6.733
2010	6.995
2011	7.342
2012	8.148
2013	8.563
2014	8.979
2015	8.803
2016	8.79
2017	8.759
2018	9.036
2019	9.813
2020	10.507
2021	11.562
2022	11.59