Year	Percent
1990	8.03
1991	8.697
1992	9.415
1993	10.185
1994	11.01
1995	11.893
1996	12.837
1997	13.843
1998	14.916
1999	16.056
2000	17.265
2001	17.039
2002	16.816
2003	16.595
2004	16.376
2005	16.16
2006	15.946
2007	15.734
2008	15.525
2009	15.318
2010	15.113
2011	15.173
2012	15.195
2013	15.191
2014	15.182
2015	15.18
2016	15.174
2017	15.072
2018	14.971
2019	14.869
2020	14.768
2021	14.666
2022	14.565
2023	14.463
2024	14.362
2025	14.26
2026	14.159
2027	14.057
2028	13.956
2029	13.854
2030	13.753