Year	Percent
1990	21.111
1991	22.142
1992	18.823
1993	19.099
1994	19.102
1995	18.533
1996	18.763
1997	18.474
1998	18.13
1999	17.648
2000	17
2001	14.5
2002	16.8
2003	13.9
2004	14.148
2005	14.4
2006	12.9
2007	13.2
2008	11.7
2009	12.3
2010	12.3
2011	10.8
2012	10.8
2013	4.8
2014	4.777
2015	4.779
2016	4.866
2017	4.674
2018	4.481
2019	4.288
2020	4.095
2021	3.902
2022	3.71
2023	3.517
2024	3.324
2025	3.131
2026	2.938
2027	2.746
2028	2.553
2029	2.36
2030	2.167