Year	Percent
1990	6.018
1991	6.043
1992	6.058
1993	6.131
1994	6.183
1995	6.256
1996	6.259
1997	6.279
1998	6.304
1999	6.37
2000	5.718
2001	5.13
2002	4.599
2003	4.12
2004	3.689
2005	3.302
2006	2.955
2007	2.642
2008	2.362
2009	2.111
2010	1.887
2011	1.685
2012	1.505
2013	1.344
2014	1.2
2015	1.235
2016	1.256
2017	1.194
2018	1.131
2019	1.069
2020	1.007
2021	0.944
2022	0.882
2023	0.819
2024	0.757
2025	0.694
2026	0.632
2027	0.569
2028	0.507
2029	0.444
2030	0.382