Year	Percent
1991	2.16388
1992	2.10939
1993	2.0474
1994	2.08031
1995	2.05358
1996	1.94853
1997	1.85419
1998	1.71808
1999	1.55393
2000	1.53455
2001	1.39226
2002	1.38574
2003	1.2488
2004	1.27649
2005	1.37677
2006	1.35242
2007	1.36604
2008	1.08091
2009	1.11045
2010	1.21589
2011	1.22021
2012	1.18889
2013	1.05876
2014	1.25617
2015	1.13849
2016	1.12564
2017	1.16303
2018	1.07004
2019	1.0454