Year	Percent
1991	3.824
1992	3.486
1993	3.965
1994	3.711
1995	3.597
1996	3.759
1997	3.498
1998	2.58
1999	2.406
2000	2.071
2001	1.85
2002	1.772
2003	1.816
2004	1.441
2005	1.372
2006	1.328
2007	1.339
2008	1.43
2009	1.052
2010	1.046
2011	1.016
2012	1.205
2013	1.447
2014	1.497
2015	1.416
2016	1.371
2017	1.285
2018	1.253
2019	1.223
2020	1.193
2021	1.168
2022	1.149