Year	Percent
1990	5.633
1991	5.935
1992	6.2
1993	5.957
1994	5.723
1995	5.497
1996	5.28
1997	5.071
1998	4.87
1999	4.676
2000	4.49
2001	4.27
2002	5.05
2003	6.95
2004	5.76
2005	4.05
2006	4.56
2007	5.26
2008	6.22
2009	5.58
2010	4.98
2011	4.81
2012	4.49
2013	5.37
2014	6.16
2015	6.4
2016	6.68
2017	6.654
2018	6.628
2019	6.602
2020	6.575
2021	6.549
2022	6.523
2023	6.497
2024	6.471
2025	6.445
2026	6.419
2027	6.393
2028	6.366
2029	6.34
2030	6.314