Year	Percent
1990	11.44
1991	11.425
1992	11.412
1993	11.39
1994	11.417
1995	11.432
1996	11.435
1997	11.444
1998	11.465
1999	11.461
2000	11.473
2001	11.482
2002	11.494
2003	11.496
2004	11.502
2005	11.509
2006	11.514
2007	11.522
2008	11.523
2009	11.516
2010	11.518
2011	11.523
2012	11.525
2013	11.526
2014	11.527
2015	11.528
2016	11.528
2017	11.532
2018	11.535
2019	11.539
2020	11.543
2021	11.547
2022	11.551
2023	11.555
2024	11.558
2025	11.562
2026	11.566
2027	11.57
2028	11.574
2029	11.578
2030	11.581