Year	Percent
1990	33.173
1991	41.616
1992	43.531
1993	40.828
1994	38.586
1995	35.397
1996	33.292
1997	35.752
1998	33.641
1999	30.835
2000	29.442
2001	27.848
2002	27.06
2003	22.493
2004	18.502
2005	15.081
2006	12.198
2007	9.802
2008	7.835
2009	6.526
2010	6.95
2011	11.153
2012	17.421
2013	13.922
2014	12.6
2015	12.22
2016	11.984
2017	11.408
2018	10.831
2019	10.254
2020	9.677
2021	9.1
2022	8.523
2023	7.947
2024	7.37
2025	6.793
2026	6.216
2027	5.639
2028	5.063
2029	4.486
2030	3.909