Year	Percent
1990	5.131
1991	5.136
1992	5.134
1993	5.123
1994	5.103
1995	5.08
1996	5.045
1997	5.005
1998	4.959
1999	4.906
2000	4.846
2001	4.804
2002	4.766
2003	4.731
2004	4.698
2005	4.673
2006	4.631
2007	4.589
2008	4.55
2009	4.51
2010	4.472
2011	4.441
2012	4.412
2013	4.386
2014	4.362
2015	4.339
2016	4.317
2017	4.285
2018	4.254
2019	4.222
2020	4.19
2021	4.159
2022	4.127
2023	4.096
2024	4.064
2025	4.032
2026	4.001
2027	3.969
2028	3.938
2029	3.906
2030	3.875