Year	Percent
1990	16.433
1991	17.6
1992	16.494
1993	15.445
1994	14.451
1995	13.51
1996	12.622
1997	11.784
1998	10.995
1999	10.253
2000	9.555
2001	8.9
2002	9.31
2003	9.3
2004	9.66
2005	9.19
2006	8.36
2007	6.56
2008	7.25
2009	8.44
2010	7.03
2011	7.24
2012	7.09
2013	5.79
2014	4.11
2015	4.57
2016	4.57
2017	4.393
2018	4.215
2019	4.038
2020	3.86
2021	3.683
2022	3.505
2023	3.328
2024	3.15
2025	2.973
2026	2.795
2027	2.618
2028	2.44
2029	2.263
2030	2.085