Year	Percent
1990	3.682
1991	3.45
1992	3.295
1993	3.147
1994	3.005
1995	2.87
1996	2.74
1997	2.896
1998	3.062
1999	3.236
2000	3.42
2001	3.614
2002	3.818
2003	4.034
2004	4.261
2005	4.5
2006	4.136
2007	3.8
2008	3.1
2009	5
2010	3.2
2011	2.811
2012	2.468
2013	2.166
2014	1.9
2015	2
2016	2.3
2017	2.227
2018	2.153
2019	2.08
2020	2.006
2021	1.933
2022	1.86
2023	1.786
2024	1.713
2025	1.639
2026	1.566
2027	1.493
2028	1.419
2029	1.346
2030	1.273