Year	Percent
1990	3.261
1991	3.287
1992	3.266
1993	3.333
1994	3.388
1995	3.457
1996	3.449
1997	3.46
1998	3.445
1999	3.429
2000	3.414
2001	3.399
2002	3.384
2003	3.369
2004	3.354
2005	3.339
2006	3.325
2007	3.31
2008	2.33
2009	1.97
2010	3.11
2011	2.2
2012	1.9
2013	1.867
2014	1.835
2015	1.83
2016	1.821
2017	1.747
2018	1.673
2019	1.599
2020	1.525
2021	1.45
2022	1.376
2023	1.302
2024	1.228
2025	1.154
2026	1.08
2027	1.006
2028	0.932
2029	0.858
2030	0.783