Year	Percent
1990	1.37974
1991	1.34654
1992	1.52373
1993	1.55368
1994	1.56503
1995	2.19935
1996	2.17136
1997	1.97331
1998	1.98475
1999	1.96431
2000	1.96795
2001	1.52453
2002	1.5176
2003	1.37178
2004	0.59711
2005	0.60978
2006	0.51584
2007	0.36327
2008	0.35885
2009	0.4452
2010	0.4285
2011	0.42631
2012	0.3202
2013	0.31639
2014	0.59527
2015	0.59009
2016	0.58257
2017	0.56273
2018	0.28074
2019	0.2749
2020	0.27461