Year	Percent
1990	10.975
1991	11.767
1992	12.15
1993	12.844
1994	13.886
1995	14.541
1996	14.342
1997	14.029
1998	14.047
1999	13.712
2000	12.882
2001	11.907
2002	11.28
2003	9.3
2004	7.51
2005	7.106
2006	6.721
2007	6.356
2008	6.01
2009	5.205
2010	4.503
2011	3.892
2012	3.361
2013	2.9
2014	3.41
2015	4.006
2016	4.01
2017	3.76
2018	3.509
2019	3.259
2020	3.009
2021	2.759
2022	2.509
2023	2.259
2024	2.009
2025	1.758
2026	1.508
2027	1.258
2028	1.008
2029	0.758
2030	0.508