Year	Percent
1990	5.88
1991	5.411
1992	4.813
1993	4.609
1994	4.525
1995	4.444
1996	4.325
1997	4.208
1998	4.095
1999	3.984
2000	3.877
2001	3.772
2002	3.67
2003	3.57
2004	2.994
2005	2.508
2006	2.1
2007	1.89
2008	1.7
2009	1.4
2010	1.375
2011	1.363
2012	1.334
2013	1.325
2014	1.321
2015	1.318
2016	1.336
2017	1.268
2018	1.201
2019	1.133
2020	1.065
2021	0.998
2022	0.93
2023	0.862
2024	0.795
2025	0.727
2026	0.659
2027	0.592
2028	0.524
2029	0.456
2030	0.388