Year	Percent
1990	1.38649
1991	1.34239
1992	1.30464
1993	1.2617
1994	1.22289
1995	1.9852
1996	1.91405
1997	1.50879
1998	1.48246
1999	1.45724
2000	1.43311
2001	1.41035
2002	1.3894
2003	1.37082
2004	1.35501
2005	1.34198
2006	1.34341
2007	1.31563
2008	1.28708
2009	1.25437
2010	1.22793
2011	1.20252
2012	1.17233
2013	1.17031
2014	1.16475
2015	1.15983
2016	1.14833
2017	1.14873
2018	1.13676
2019	1.13192
2020	1.18035