Year	Percent
1990	4.02
1991	4.12
1992	4.07
1993	4
1994	4.04
1995	4.24
1996	3.98
1997	3.86
1998	3.89
1999	3.84
2000	3.73
2001	3.52
2002	3.78
2003	4.01
2004	3.93
2005	3.86
2006	4.04
2007	4.45
2008	4.64
2009	4.4
2010	4.43
2011	4.23
2012	4.2
2013	4.38
2014	4.63
2015	4.64
2016	4.751
2017	4.79
2018	4.829
2019	4.868
2020	4.908
2021	4.947
2022	4.986
2023	5.025
2024	5.064
2025	5.103
2026	5.143
2027	5.182
2028	5.221
2029	5.26
2030	5.299