Year	Percent
1990	3.41
1991	2.14
1992	2.56
1993	3.47
1994	3.559
1995	3.65
1996	3.14
1997	4.42
1998	3.93
1999	4.22
2000	4.76
2001	4.535
2002	4.32
2003	4.61
2004	4.1
2005	4.15
2006	5.32
2007	4.22
2008	4.18
2009	4.009
2010	3.845
2011	3.687
2012	3.536
2013	3.39
2014	3.25
2015	3.116
2016	3.156
2017	3.088
2018	3.02
2019	2.952
2020	2.884
2021	2.816
2022	2.748
2023	2.68
2024	2.612
2025	2.544
2026	2.476
2027	2.408
2028	2.34
2029	2.272
2030	2.205