Year	Percent
1990	3.696
1991	3.898
1992	3.909
1993	3.91
1994	3.38
1995	3.42
1996	3.32
1997	3.04
1998	2.58
1999	3.17
2000	2.47
2001	2.36
2002	2.42
2003	2.33
2004	2.33
2005	2.31
2006	2.44
2007	2.72
2008	2.79
2009	3.19
2010	3.15
2011	3.26
2012	3.31
2013	3.78
2014	3.49
2015	4.11
2016	4.56
2017	4.618
2018	4.675
2019	4.733
2020	4.791
2021	4.848
2022	4.906
2023	4.964
2024	5.021
2025	5.079
2026	5.137
2027	5.194
2028	5.252
2029	5.309
2030	5.367