Year	Percent
1991	3.843
1992	2.015
1993	2.234
1994	3.79
1995	3.85
1996	3.841
1997	3.785
1998	3.72
1999	3.789
2000	3.67
2001	3.702
2002	3.625
2003	3.407
2004	3.461
2005	3.447
2006	3.455
2007	3.449
2008	3.481
2009	3.614
2010	3.499
2011	3.26
2012	3.275
2013	3.364
2014	3.329
2015	3.319
2016	3.23
2017	3.273
2018	3.272
2019	3.267
2020	3.266
2021	3.264
2022	3.262