Year	Percent
1993	4.256
1994	4.27337
1995	4.03607
1996	3.89475
1997	3.48925
1998	3.50696
1999	3.2176
2000	3.25053
2001	3.20353
2002	2.65959
2003	2.44003
2004	2.41539
2005	2.28464
2006	2.16496
2007	2.08891
2008	1.91993
2009	1.75679
2010	1.5406
2011	1.98251
2012	2.25119
2013	2.36477
2014	2.41345
2015	2.21121
2016	2.08705
2017	2.05761
2018	1.93625
2019	1.86085
2020	1.96061
2021	1.84536
2022	1.90152