Year	Percent
1990	3.13
1991	3.131
1992	3.127
1993	3.12
1994	3.113
1995	3.108
1996	3.107
1997	3.108
1998	3.11
1999	3.111
2000	3.112
2001	3.112
2002	3.113
2003	3.113
2004	3.114
2005	3.533
2006	3.406
2007	3.276
2008	3.159
2009	3.221
2010	3.203
2011	3.181
2012	3.199
2013	3.146
2014	3.12
2015	3.055
2016	2.996
2017	2.999
2018	3.002
2019	3.005
2020	3.009
2021	3.012
2022	3.015
2023	3.018
2024	3.021
2025	3.025
2026	3.028
2027	3.031
2028	3.034
2029	3.037
2030	3.041