Year	Percent
1990	4.83078
1991	4.97399
1992	4.90375
1993	4.95763
1994	4.68088
1995	4.49853
1996	4.32994
1997	3.60066
1998	3.61989
1999	3.50984
2000	3.35741
2001	3.38635
2002	3.72048
2003	3.67952
2004	3.32723
2005	3.34711
2006	3.19241
2007	3.19997
2008	3.19952
2009	2.81718
2010	2.94823
2011	2.97676
2012	2.9902
2013	3.06013
2014	3.05348
2015	3.0685
2016	3.04401
2017	3.07134
2018	3.1277
2019	3.10436
2020	3.16551