Year	Percent
1990	7.146
1991	7.156
1992	7.319
1993	7.453
1994	7.401
1995	7.671
1996	7.589
1997	7.808
1998	7.852
1999	8.023
2000	8.156
2001	8.161
2002	8.234
2003	8.205
2004	8.201
2005	8.246
2006	8.141
2007	8.173
2008	8.12
2009	8.106
2010	8.082
2011	8
2012	8.5
2013	8.392
2014	8.366
2015	8.263
2016	8.277
2017	8.293
2018	8.309
2019	8.325
2020	8.341
2021	8.357
2022	8.373
2023	8.389
2024	8.405
2025	8.421
2026	8.437
2027	8.454
2028	8.47
2029	8.486
2030	8.502