Year	Percent
1992	2.50332
1993	2.03154
1994	1.94963
1995	2.51527
1996	2.29603
1997	2.6267
1998	2.47418
1999	2.03164
2000	1.94627
2001	1.92115
2002	1.91385
2003	1.87991
2004	1.97218
2005	1.96127
2006	1.94349
2007	1.95824
2008	1.94414
2009	1.96811
2010	1.88468
2011	1.79294
2012	1.79683
2013	1.66638
2014	1.70631
2015	1.98342
2016	1.93395
2017	1.94878
2018	1.95164
2019	1.97558
2020	1.99001