Year	Percent
1990	14.8
1991	14.92
1992	14.48
1993	14.72
1994	14.38
1995	14.39
1996	13.05
1997	12.87
1998	12.45
1999	11.49
2000	11.25
2001	10.91
2002	11.54
2003	11.38
2004	10.83
2005	10.66
2006	11.18
2007	11.95
2008	11.74
2009	11.95
2010	12.07
2011	12
2012	12.46
2013	12.82
2014	13.31
2015	13.58
2016	13.65
2017	13.756
2018	13.861
2019	13.967
2020	14.072
2021	14.177
2022	14.283
2023	14.388
2024	14.494
2025	14.599
2026	14.705
2027	14.81
2028	14.915
2029	15.021
2030	15.126