Year	Percent
1990	16.16
1991	16.61
1992	16.68
1993	16
1994	15.89
1995	15.64
1996	15.36
1997	15.39
1998	15.18
1999	14.87
2000	14.4
2001	13.75
2002	13.16
2003	13
2004	12.92
2005	12.73
2006	12.95
2007	12.95
2008	13.05
2009	13.14
2010	13.33
2011	13.1
2012	13.38
2013	13.83
2014	14.52
2015	15.3
2016	15.92
2017	15.887
2018	15.854
2019	15.82
2020	15.787
2021	15.754
2022	15.721
2023	15.687
2024	15.654
2025	15.621
2026	15.588
2027	15.555
2028	15.521
2029	15.488
2030	15.455