Year	Percent
1990	3.45283
1991	3.23897
1992	2.20534
1993	2.15338
1994	2.56409
1995	7.6413
1996	7.48291
1997	6.90426
1998	6.75874
1999	6.62862
2000	6.4934
2001	6.35964
2002	6.22787
2003	6.09784
2004	5.96596
2005	5.82989
2006	5.68865
2007	5.54897
2008	5.41988
2009	5.30445
2010	5.19769
2011	5.09616
2012	5.00028
2013	4.90787
2014	4.81685
2015	4.72895
2016	4.64435
2017	4.55943
2018	4.48395
2019	4.4022
2020	4.35767