Year	Percent
1990	11.139
1991	11.3
1992	13.475
1993	16.218
1994	18.99
1995	20.848
1996	20.808
1997	20.156
1998	19.012
1999	18.22
2000	16.88
2001	15.62
2002	14.438
2003	13.331
2004	12.297
2005	11.332
2006	10.434
2007	9.6
2008	9.519
2009	9.438
2010	9.358
2011	9.279
2012	9.2
2013	7.1
2014	6
2015	7.4
2016	7.4
2017	7.074
2018	6.748
2019	6.422
2020	6.097
2021	5.771
2022	5.445
2023	5.119
2024	4.793
2025	4.467
2026	4.141
2027	3.815
2028	3.49
2029	3.164
2030	2.838