Year	Percent
1990	2.36673
1991	1.91463
1992	1.67481
1993	1.48708
1994	1.51553
1995	1.38823
1996	1.35359
1997	1.47178
1998	1.21464
1999	1.30175
2000	1.1218
2001	1.10314
2002	1.08919
2003	1.102
2004	1.03022
2005	1.92738
2006	0.64866
2007	0.75228
2008	0.7299
2009	1.01726
2010	0.93841
2011	0.93064
2012	0.96505
2013	0.95553
2014	0.94705
2015	0.90332
2016	0.86472
2017	0.83307
2018	0.83151
2019	0.81409
2020	0.88275