Year	Percent
1990	6.9
1991	7.179
1992	7.484
1993	7.856
1994	7.927
1995	7.981
1996	7.93
1997	7.561
1998	7.208
1999	6.87
2000	7.265
2001	7.682
2002	8.12
2003	7.17
2004	4.93
2005	6.73
2006	5.07
2007	4.99
2008	5.11
2009	4.79
2010	5.17
2011	3.77
2012	4.47
2013	3.31
2014	3.1
2015	4.57
2016	5.28
2017	5.061
2018	4.842
2019	4.624
2020	4.405
2021	4.186
2022	3.967
2023	3.748
2024	3.529
2025	3.311
2026	3.092
2027	2.873
2028	2.654
2029	2.435
2030	2.216