Year	Percent
1990	3.71
1991	3.76
1992	3.53
1993	3.21
1994	3.01
1995	3.02
1996	2.67
1997	2.31
1998	2.31
1999	2.56
2000	2.52
2001	2.66
2002	2.39
2003	2.49
2004	2.59
2005	3.2
2006	3.38
2007	3.25
2008	3.13
2009	2.88
2010	2.72
2011	2.56
2012	2.68
2013	2.42
2014	2.32
2015	2.43
2016	2.53
2017	2.526
2018	2.521
2019	2.517
2020	2.513
2021	2.508
2022	2.504
2023	2.5
2024	2.496
2025	2.491
2026	2.487
2027	2.483
2028	2.478
2029	2.474
2030	2.47