Year	Percent
1991	2.99
1992	2.405
1993	2.672
1994	2.525
1995	2.259
1996	2.281
1997	2.387
1998	2.416
1999	2.27
2000	2.383
2001	2.436
2002	2.033
2003	2.01
2004	2.135
2005	2.176
2006	2.078
2007	1.882
2008	1.769
2009	1.714
2010	1.839
2011	1.633
2012	1.609
2013	1.238
2014	1.395
2015	1.508
2016	1.384
2017	1.347
2018	1.308
2019	1.28
2020	1.254
2021	1.228
2022	1.205