Year	Percent
1990	9.562
1991	10.2
1992	9.604
1993	9.039
1994	8.504
1995	7.998
1996	7.519
1997	7.067
1998	6.641
1999	6.238
2000	5.858
2001	5.5
2002	5.11
2003	5.53
2004	6.23
2005	5.63
2006	5.83
2007	4.42
2008	5.1
2009	5.04
2010	4.44
2011	4.33
2012	3.59
2013	2.72
2014	2.57
2015	2.46
2016	1.76
2017	1.706
2018	1.653
2019	1.599
2020	1.546
2021	1.492
2022	1.438
2023	1.385
2024	1.331
2025	1.278
2026	1.224
2027	1.17
2028	1.117
2029	1.063
2030	1.01