Year	Percent
1990	3.00167
1991	3.04374
1992	3.39837
1993	3.41602
1994	3.42634
1995	4.86592
1996	5.39219
1997	5.18574
1998	4.66726
1999	4.25928
2000	3.88906
2001	2.72267
2002	2.65815
2003	2.65964
2004	2.02389
2005	2.4749
2006	2.44641
2007	2.33838
2008	2.40649
2009	2.30726
2010	2.30975
2011	2.37076
2012	2.31133
2013	2.28548
2014	2.27193
2015	2.17517
2016	2.08207
2017	2.0035
2018	2.27193
2019	2.26457
2020	2.39242