Year	Percent
1992	4.51909
1993	4.59833
1994	4.66983
1995	6.34554
1996	5.02439
1997	4.96108
1998	5.01888
1999	5.09156
2000	5.12372
2001	3.10415
2002	2.06406
2003	1.69904
2004	1.67816
2005	1.7766
2006	0.92003
2007	1.17743
2008	1.19622
2009	1.17125
2010	1.16043
2011	1.06207
2012	1.11011
2013	0.69222
2014	0.67669
2015	0.64968
2016	0.62731
2017	0.65344
2018	0.63857
2019	0.55827
2020	0.59371