Year	Percent
1991	5.297
1992	5.737
1993	5.559
1994	3.724
1995	4.65
1996	4.944
1997	5.196
1998	5.194
1999	5.296
2000	5.422
2001	5.618
2002	6.089
2003	6.303
2004	6.671
2005	7.2
2006	7.72
2007	8.333
2008	9.023
2009	9.501
2010	10.179
2011	10.844
2012	11.639
2013	14.532
2014	18.919
2015	19.882
2016	20.26
2017	20.639
2018	21.352
2019	22.137
2020	22.958
2021	23.822
2022	24.711