Year	Percent
1990	9.31
1991	8.51
1992	9.77
1993	6.59
1994	9.8
1995	11.03
1996	11.58
1997	11.2
1998	13.3
1999	15.17
2000	11.26
2001	12.34
2002	11.5
2003	10.36
2004	7.28
2005	6.56
2006	5.74
2007	5.69
2008	5.74
2009	5.88
2010	5.87
2011	6.53
2012	6.4
2013	6.19
2014	5.38
2015	5.81
2016	5.51
2017	5.277
2018	5.043
2019	4.81
2020	4.577
2021	4.344
2022	4.11
2023	3.877
2024	3.644
2025	3.41
2026	3.177
2027	2.944
2028	2.71
2029	2.477
2030	2.244