Year	Percent
1990	3.723
1991	3.793
1992	3.849
1993	3.937
1994	3.824
1995	3.759
1996	3.743
1997	3.706
1998	3.609
1999	3.656
2000	3.617
2001	3.6
2002	3.2
2003	4.202
2004	5.5
2005	4.976
2006	4.5
2007	5.022
2008	5.6
2009	4.748
2010	4.02
2011	3.4
2012	3.9
2013	2.8
2014	2.646
2015	2.5
2016	2.496
2017	2.46
2018	2.424
2019	2.387
2020	2.351
2021	2.315
2022	2.279
2023	2.243
2024	2.207
2025	2.17
2026	2.134
2027	2.098
2028	2.062
2029	2.026
2030	1.99