Year	Percent
1990	2.84873
1991	2.78002
1992	2.75471
1995	3.60659
1996	3.51379
1997	2.56499
1998	2.52399
1999	2.48568
2000	2.43037
2001	2.31754
2002	2.11223
2003	2.02163
2004	2.15375
2005	2.04809
2006	1.98595
2007	1.91097
2008	1.86967
2009	1.83951
2010	2.11473
2011	2.09503
2012	2.08
2013	2.06231
2014	2.02749
2015	2.05524
2016	2.55812
2017	2.55941
2018	2.5057
2019	2.46263
2020	1.99466