Year	Percent
1990	0.609
1991	0.637
1992	0.652
1993	0.687
1994	0.719
1995	0.729
1996	0.737
1997	0.749
1998	0.76
1999	0.772
2000	0.784
2001	0.796
2002	0.808
2003	0.821
2004	0.834
2005	0.846
2006	0.86
2007	0.873
2008	0.886
2009	0.9
2010	1.3
2011	1.027
2012	0.811
2013	0.88
2014	0.45
2015	0.438
2016	0.424
2017	0.427
2018	0.429
2019	0.431
2020	0.433
2021	0.436
2022	0.438
2023	0.44
2024	0.442
2025	0.445
2026	0.447
2027	0.449
2028	0.451
2029	0.454
2030	0.456