Year	Percent
1990	7.733
1991	7.647
1992	7.616
1993	7.701
1994	7.602
1995	7.761
1996	7.935
1997	7.938
1998	7.985
1999	8.031
2000	8.197
2001	8.358
2002	8.451
2003	8.546
2004	8.642
2005	8.725
2006	8.756
2007	8.883
2008	8.891
2009	8.761
2010	8.755
2011	8.869
2012	8.86
2013	8.797
2014	8.807
2015	8.828
2016	8.957
2017	8.994
2018	9.031
2019	9.067
2020	9.104
2021	9.141
2022	9.177
2023	9.214
2024	9.251
2025	9.288
2026	9.324
2027	9.361
2028	9.398
2029	9.434
2030	9.471