Year	Percent
1990	2.798
1991	2.957
1992	3.1
1993	2.892
1994	2.697
1995	2.515
1996	2.345
1997	2.186
1998	2.038
1999	1.899
2000	1.77
2001	1.52
2002	1.81
2003	2.29
2004	1.86
2005	1.43
2006	1.46
2007	1.56
2008	2.12
2009	1.86
2010	1.63
2011	1.57
2012	1.87
2013	2.18
2014	2.57
2015	2.73
2016	2.86
2017	2.858
2018	2.857
2019	2.855
2020	2.854
2021	2.852
2022	2.851
2023	2.849
2024	2.848
2025	2.846
2026	2.845
2027	2.843
2028	2.842
2029	2.84
2030	2.838