Year	Percent
1990	5.69521
1991	4.75126
1992	5.30739
1993	4.93433
1994	4.73136
1995	6.38305
1996	6.28205
1997	6.19134
1998	6.08196
1999	5.95967
2000	5.8636
2001	5.73837
2002	5.39344
2003	5.24122
2004	4.94597
2005	4.85395
2006	4.75364
2007	4.55108
2008	4.35488
2009	4.16776
2010	3.69585
2011	3.09617
2012	2.64207
2013	2.34636
2014	2.19625
2015	2.07975
2016	1.95574
2017	1.88947
2018	1.86964
2019	1.925
2020	2.13257