Year	Percent
1990	5.782
1991	5.792
1992	5.8
1993	5.811
1994	5.797
1995	5.787
1996	5.785
1997	5.135
1998	4.554
1999	4.036
2000	3.575
2001	3.165
2002	2.8
2003	2.958
2004	3.124
2005	3.3
2006	3.484
2007	3.679
2008	3.798
2009	3.92
2010	4.046
2011	4.176
2012	4.31
2013	4.303
2014	4.293
2015	4.279
2016	4.272
2017	4.355
2018	4.437
2019	4.52
2020	4.602
2021	4.685
2022	4.768
2023	4.85
2024	4.933
2025	5.015
2026	5.098
2027	5.18
2028	5.263
2029	5.346
2030	5.428