Year	Percent
1990	3.494
1991	3.776
1992	3.9
1993	3.887
1994	3.825
1995	3.674
1996	3.557
1997	3.545
1998	3.429
1999	3.652
2000	3.575
2001	3.559
2002	3.524
2003	3.477
2004	3.385
2005	3.3
2006	3.55
2007	3.819
2008	4.107
2009	4.415
2010	4.746
2011	5.1
2012	5.06
2013	4.956
2014	4.906
2015	4.817
2016	4.752
2017	4.871
2018	4.991
2019	5.11
2020	5.229
2021	5.349
2022	5.468
2023	5.587
2024	5.707
2025	5.826
2026	5.945
2027	6.065
2028	6.184
2029	6.304
2030	6.423