Year	Percent
1990	4.68
1991	4.692
1992	4.668
1993	4.679
1994	4.581
1995	4.479
1996	4.313
1997	4.081
1998	3.89
1999	4.64
2000	6.76
2001	4.79
2002	3.69
2003	4.44
2004	3.2
2005	2.6
2006	3.25
2007	3.4
2008	3.68
2009	3.83
2010	3.19
2011	3.97
2012	4.55
2013	3.57
2014	4.39
2015	4.84
2016	6.63
2017	6.559
2018	6.488
2019	6.418
2020	6.347
2021	6.276
2022	6.205
2023	6.135
2024	6.064
2025	5.993
2026	5.922
2027	5.851
2028	5.781
2029	5.71
2030	5.639